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Language shift, also known as language transfer or language replacement or language assimilation, is the process whereby a community of speakers of a language shifts to speaking a completely different language, usually over an extended period of time. Often, languages that are perceived to be higher status stabilise or spread at the expense of other languages that are perceived by their own speakers to be lower-status. An example is the shift from Gaulish to Latin that occurred in what is now France during the time of the Roman Empire.
For prehistory, Forster et al. (2004) and Forster and Renfrew (2011) observe that there is a correlation of language shift with intrusive male Y chromosomes but not necessarily with intrusive female mtDNA. They conclude that technological innovation (the transition from hunting-gathering to agriculture, or from stone to metal tools) or military prowess (as in the abduction of British women by Vikings to Iceland) causes immigration of at least some males, who are perceived to be of higher status than local males. Then, in mixed-language marriages with these males, prehistoric women prefer to transmit the "higher-status" spouse's language to their children, yielding the language/Y-chromosome correlation seen today.
The process whereby a community of speakers of one language becomes bilingual in another language, and gradually shifts allegiance to the second language is called assimilation. When a linguistic community ceases to use their original language, language death is said to occur.
The rate of assimilation is the percentage of individuals with a given mother tongue who speak another language more often in the home. The data are used to measure the use of a given language in the lifetime of a person, or most often across generations within a linguistic community.
In the context of the Indo-European migrations, it has been noted that small groups can change a larger cultural area. Michael Witzel refers to Ehret's model[note 1] "which stresses the osmosis, or a "billiard ball," or Mallory's Kulturkugel, effect of cultural transmission." According to Ehret, ethnicity and language can shift with relative ease in small societies, due to the cultural, economic and military choices made by the local population in question. The group bringing new traits may initially be small, contributing features that can be fewer in number than those of the already local culture. The emerging combined group may then initiate a recurrent, expansionist process of ethnic and language shift.
David Anthony notes that the spread of the Indo-European languages probably did not happen through "chain-type folk migrations", but by the introduction of these languages by ritual and political elites, which are emulated by large groups of people.[note 2] Anthony explains:
Language shift can be understood best as a social strategy through which individuals and groups compete for positions of prestige, power, and domestic security ... What is important, then, is not just dominance, but vertical social mobility and a linkage between language and access to positions of prestige and power ... A relatively small immigrant elite population can encourage widespread language shift among numerically dominant indigenes in a non-state or pre-state context if the elite employs a specific combination of encouragements and punishments. Ethnohistorical cases ... demonstrate that small elite groups have successfully imposed their languages in non-state situations.
Anthony gives the example of the Luo-speaking Acholi in northern Uganda in the 17th and 18th century, whose language spread rapidly in the 19th century. Anthony notes that "Indo-European languages probably spread in a similar way among the tribal societies of prehistoric Europe", carried forward by "Indo-European chiefs" and their "ideology of political clientage". Anthony notes that "elite recruitment" may be a suitable term for this system.[note 3]
Until the mid 19th century, southern Carinthia in Austria had an overwhelming Slovene-speaking majority: in the 1820s, around 97% of the inhabitants south of the line Villach-Klagenfurt-Diex spoke Slovene as their native language. In the course of the 19th century, this number dropped significantly. By 1920, already a third of the population of the area had shifted to German as their main language of communication. After the Carinthian Plebiscite in the 1920s, and especially after World War II, most of the population shifted from Slovene to German. In the same region, today only some 13% of the people still speaks Slovene, while more than 85% of the population speaks German. The figures for the whole region are equally telling: in 1818, around 35% of the population of Carinthia spoke Slovene; by 1910, this number dropped to 15.6% and by 2001 to 2.3%. These changes were almost entirely the result of a language shift in the population, with emigration and genocide (by the Nazis during the Second World War) playing only a minor role.
Despite the withdrawal of Belarus from the USSR proclaimed in 1991, use of the Belarusian language is declining. According to a study done by the Belarusian government in 2009, 72% of Belarusians speak Russian at home, and Belarusian is used by only 11.9% of Belarusians. 52.5% of Belarusians can speak and read Belarusian. Only 29.4% can speak, read and write it. According to the research, one out of ten Belarusians does not understand Belarusian.
In the last two centuries, Brussels transformed from an exclusively Dutch-speaking city to a bilingual city with French as the majority language and lingua franca. The language shift began in the 18th century and accelerated as Belgium became independent and Brussels expanded out past its original city boundaries. From 1880 on, more and more Dutch-speaking people became bilingual, resulting in a rise of monolingual French-speakers after 1910.
Halfway through the 20th century, the number of monolingual French-speakers began to predominate over the (mostly) bilingual Flemish inhabitants. Only since the 1960s, after the establishment of the Belgian language border and the socio-economic development of Flanders took full effect, could Dutch use stem the tide of increasing French use. French remains the city's predominant language while Dutch is spoken by a growing minority.
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The use of the French language in Canada is complex. In English-speaking regions of Canada, many former Canadian French language minorities have disappeared. Meanwhile, in Quebec, the decline of French has been reversed, and given high rates of emigration and substantial intermarriage with French Canadians, the English language has declined. Quebec's Eastern Townships, once a predominantly English-speaking region, is now overwhelmingly French-speaking. The French-speaking populations of neighboring Ontario and New Brunswick, once on the decline, have also rebounded.
Historically, an important language shift in China has been the near disappearance of the Manchu language. When China was ruled by the Qing dynasty, whose Emperors were Manchu, Chinese and Manchu had co-official status, and the Emperor heavily subsidized and promoted education in Manchu, but the fact that most of the Manchu Eight Banners lived in garrisons with Mandarin speaking Han Bannermen located across Han Chinese civilian populated cities meant that most Manchus spoke the Beijing dialect of Mandarin by the 19th century and the only Manchu speakers were garrisons left in their homeland of Heilongjiang. Today there are fewer than 100 native speakers of Manchu.
At the current time, language shift is occurring all across China. Many languages of minority ethnic groups are declining, as well as the many regional varieties of Chinese. Generally the shift is in favour of Standard Chinese (Mandarin), but in the province of Guangdong the cultural influence of nearby Hong Kong has meant local dialects and languages are being abandoned for Cantonese instead and in cities such as Zhongshan, Shunde, Nanhai District, Panyu and Dongguan, younger native residents mostly communicate in Cantonese, instead of their mother-tongue.
In Egypt, the Coptic language, a descendant of the Afro-Asiatic Egyptian language, was in decline in usage since the time of the Arab conquest in the 7th century. By the 17th century, it was eventually supplanted as a spoken language by Egyptian Arabic. Coptic is today mainly used by the Coptic Church as a liturgical language. In the Siwa Oasis, a local variety of Berber is also used alongside Arabic.
In Ethiopia, various populations of Nilotic origin have shifted languages over the centuries, adopting the idioms of their Afro-Asiatic-speaking neighbors in the northern areas. Among these groups are the Daasanach or Marille, who today speak the Daasanach language. It belongs to the Cushitic branch of the Afro-Asiatic family. However, modern genetic analysis of the Daasanach indicates that they are more closely related to Nilo-Saharan and Niger-Congo-speaking populations inhabiting Tanzania than they are to the Cushitic and Semitic Afro-Asiatic-speaking populations of Ethiopia. This suggests that the Daasanach were originally Nilo-Saharan speakers, sharing common origins with the Pokot. In the 19th century, the Nilotic ancestors of these two populations are believed to have begun separate migrations, with one group heading southwards into the African Great Lakes region and the other group settling in southern Ethiopia. There, the early Daasanach Nilotes would have come into contact with a Cushitic-speaking population, and eventually adopted this group's Afro-Asiatic language.
Finland still has coastal Swedish-speaking enclaves, unlike Estonia where the last coastal Swedes were decimated or escaped to Sweden in 1944. As Finland was under Swedish rule from the medieval ages until 1809, the language of education was Swedish, with Finnish being allowed as a medium of education at the university only in the 19th century, and the first thesis in Finnish being published in 1858. Several of the coastal cities were multilingual; Viipuri had newspapers in Swedish, Finnish, Russian and German. However, the industrialization in the prewar and especially the postwar era and the "escape from the countryside" of the 1960s changed the demography of the major cities and led to the Finnish language dominating. While Helsinki was a predominantly Swedish-speaking city in 1910, the Swedish-speaking minority is now 6% of the population.
- Alsace and Lorraine
In Alsace, France, a longtime Alsatian-speaking region, the native Germanic dialect has been declining after a period of being banned at school by the French government after the First World War and the Second World War. It is being replaced by French.
- French Flanders
French Flanders, which gradually became part of France between 1659 and 1678, was historically part of the Dutch sprachraum, the native dialect being West Flemish (French Flemish). This is corroborated by the Dutch origin of several town names in the region, such as that of 'Dunkerque' (Dunkirk) which is a French phonetic rendition of the original Dutch name 'Duinkerke' (meaning 'church in the dunes'). The linguistic situation did not change dramatically until the French Revolution in 1789, and Dutch continued to fulfill the main functions of a cultural language throughout the 18th century. During the 19th century, especially in the second half of it, Dutch was banned from all levels of education and lost most of its functions as a cultural language. The larger cities had become predominantly French-speaking by the end of the 19th century.
However, in the countryside, many elementary schools continued to teach in Dutch until World War I, and the Roman Catholic Church continued to preach and teach the catechism in Flemish in many parishes. Nonetheless, since French enjoyed a much higher status than Dutch, from about the interbellum onward, everybody became bilingual, the generation born after World War II being raised exclusively in French. In the countryside, the passing on of Flemish stopped during the 1930s or 1940s. Consequently, the vast majority of those still having an active command of Flemish are older than 60. Therefore, complete extinction of French Flemish can be expected in the coming decades.
- Basque Country
The French Basque Country has been subject to intense French-language pressure exerted over the Basque-speaking communities. Basque was both persecuted and excluded from administration and official public use during the takeover of the National Convention (1792-1795), War of the Pyrenees and the Napoleonic period. The compulsory national education system imposed early on a French-only approach (mid-19th century), marginalizing Basque, and by the 1960s family transmission was grinding to a halt in many areas at the feet of the Pyrenees.
By the 2010s, the receding trend has been somewhat mitigated by the establishment of Basque schooling (the ikastolak) spearheaded by the network Seaska, as well as the influence of the Basque territories from Spain.
According to Fañch Broudic, Breton has lost 80% of its speakers in 60 years. Other sources mention that 70% of Breton speakers are over 60. Furthermore, 60% of children received Breton from their parents in the 20s and only 6% in the 80s. Since the 1980s, monolingual speakers are no longer attested.
On the 27 October 2015, the Senate rejected the draft law on ratification of the European Charter for Regional or Minority Languages driving away the assumption of Congress for the adoption of the constitutional reform which would have given the value and legitimacy to regional languages such as Breton.
Corsican was long employed as a conglomerate of local vernaculars in combination with Italian, the official language in Corsica until 1859; afterwards Italian was replaced by French, owing to the acquisition of the island by France from Genoa in 1768. Over the next two centuries, the use of French grew to the extent that, by the Liberation in 1945, all islanders had a working knowledge of French. The 20th century saw a wholesale language shift, with islanders changing their language practices to the extent that there were no monolingual Corsican speakers left by the 1960s. By 1995, an estimated 65 percent of islanders had some degree of proficiency in Corsican, and a small minority, perhaps 10 percent, used Corsican as a first language.
- Southern Schleswig
In Southern Schleswig, an area that belonged to Denmark until the Second Schleswig War 1864, there was from the 17th and up to the 20th centuries a language shift from Danish and North Frisian dialects to Low German and later High German. Historically, most of the region was part of the Danish and North Frisian Language area, adjacent in the South to the German-speaking Holstein. But with the reformation in the 16th century German became church language and in the 19th century also school language in the southern parts of Schleswig. Added to this came the influence of German-speaking Holsatian nobility and merchants. German was (occasionally) also spoken at the royal court in Copenhagen. This political and economic development led gradually to a German language dominating in the southern parts of Schleswig. Native dialects such as the Angel Danish or Eiderstedt Frisian vanished. In the Flensburg area, there arose the mixed language Petuh combining Danish and German elements. So late as in 1851 (in the period of nationalization) the Danish government tried to stop the Language shift, but without success in the long run. After the Second Schleswig War the Prussians introduced a number of language policy measures in the other way to expand the use of (High) German as the language of administration, schooling and church service.
Today, Danish and North Frisian are recognized as minority languages in the federal state of Schleswig-Holstein.
In Hong Kong, Cantonese became the dominant language spoken in society since widespread immigration to Hong Kong began from the 1940s onward. With immigrants of differing mother tongues, communication was hard without a dominant language. With Cantonese originating from the capital of neighboring Canton province, Cantonese became the dominant language by extension, and other similar dialects started to vanish from use in Hong Kong. Original residents, or aboriginals, of Hong Kong used their own languages including the Tanka, Hakka and Waitau dialect, but with a majority of Hong Kong's population being immigrants by the 1940s and 50s, the dialects vanished at a rapid rate. Most of Hong Kong's younger generation does not understand, let alone speak, their ancestral dialects.
Beginning in the late 1990s, since Hong Kong's return to Chinese sovereignty, Mandarin Chinese has been more widely implemented in education and many other areas of official society. Though adoption of Mandarin Chinese into society has been rapidly implemented, most Hong Kong residents would not regard it as a first language/dialect. Most Hong Kong residents prefer to communicate in Cantonese in everyday life.
It is natural that Mandarin Chinese speakers and Cantonese speakers could not mutually understand each other without learning the languages, due to vast difference in pronunciation, intonation, sentence structure and terminology. Furthermore, cultural difference between Hong Kong and China brings upon the variations between the Cantonese used in Hong Kong and that in Canton Province.
Cumans seeking refuge from the Turko-Mongols settled in Hungary and were later Magyarized. The Jassic people of Hungary originally spoke the Jassic dialect of Ossetic, but have completely adopted the Hungarian language, forgetting their previous Ossetian language. The territory of today's Hungary was also previously settled by Slavic tribes, which became gradually assimilated to the Hungarian language. Also, language shift may have happened during Hungarian pre-history, as the prehistoric culture of Magyars shows very little similarity to the other Uralic peoples.
The Italian peninsula, the Po river basin and the nearby islands are home to a conglomerate of different languages, Latin-derived for the most part. Italy would be politically organized into several states up to the late 19th century.
Since the times of the Renaissance, a trans-Italian language was developed in central Italy, based on Florentine Tuscan; in light of its cultural prestige, it started to be employed for formal, literary and written purposes among the literate classes from the various states of mainland Italy, Sicily and Corsica (France), sidelining the other dialects in education and formal settings. Thus, literary Florentine established itself as the single most representative dialect of Italy long before its political unification in 1861, Tuscan having been officially adopted by the preunitarian states. Italian further expanded as a commonly spoken linguistic form for everyday use throughout the country after World War II.
Most of the other languages, with the exception of those spoken by specific ethno-linguistic groups, long served as local vernaculars alongside Italian; because of that, they have been improperly labelled as "dialects" by their own speakers, but they are still usually spoken just as much as standard Italian in a diglossic spectrum with little conflict.
For instance, the local Venetian dialects in Northeast Italy are widely used and locally promoted in the region; after all, Italian had been an integral part of the Republic of Venice since the 14th century, whose elites used to revere the most prominent Tuscan authors and tuscanize their own speech as well. On a survey made by Il Gazzettino in 2015, 70% of respondents told they spoke Venetian "very or quite often" in the family, while 68% with friends. A much lower percentage reported to use it at work (35%); the local dialect is less used in formal situations. However, the frequency of use within the family networks and friendship stopped respectively at -4 and -11 percentage points, suggesting a slow morphing to Italian, while the use in the workplace dropped to -22 percentage points. A visible generational gap has also been noted, since the students and young people under the age of 25 are the social group where the use of dialect fell below the threshold of absolute majority (respectively 43 and 41%). Nonetheless, despite some tendencies signalling the slow advancement of standard Italian, the local dialects of Veneto and the Province of Trieste are still widely spoken alongside Italian; like in much of Italy, the presence of Italian in Northeast Italy does not seem to take anything away from the region's linguistic heritage.
Like the aforementioned case of Northeast Italy, even in Southern Italy and Sicily the local dialects from the Italo-Dalmatian family are widely used in combination with standard Italian, depending upon the social context. More specifically, Italian as the prevalent language spoken among family members is spoken the least in Campania (20,7%), Calabria (25,3%) and Sicily (26,6%), contrary to frequency of use of the local dialects (Basilicata, 69,4%; Calabria 68,6%; Campania, 75,2%; Sicily, 68,8%).
- Germanic languages
Trentino's Cimbrian, a Germanic language related to Bavarian, was spoken by at least 20,000 people in the 19th Century, with 3,762 people in 1921 and fewer than 300 in 2007. The same scenario goes for Mòcheno and Walser.
Unlike the neighbouring island of Corsica (France) and elsewhere in today's Italy, where Italian was the standard language shared by the various local elites since the late Middle Ages, Italian was first officially introduced to Sardinia, to the detriment of both Spanish and Sardinian (the only surviving Neo-Latin language from the Southern branch), only in 1760 and 1764 by the then-ruling House of Savoy, from Piedmont. Because of the promotion and enforcement of the Italian language and culture upon the Sardinian population since then, the majority of the locals switched over to such politically dominant language and no longer speak their native ones, which have seen steady decline in use. The language has been in fact severely compromised to the point that only 13℅ of the children are able to speak it, and today is mostly kept as a heritage language. With the exception of a few sparsely populated areas where Sardinian can still be heard for everyday purposes, the island's indigenous languages have by now been therefore largely absorbed into Italian; the language contact ultimately resulted in the emergence of a specific variety of Italian, slightly divergent from the standard one.
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Before the 1930s, Italian was the only official language of Malta, although it was spoken by only the upper classes, with Maltese being spoken by the lower class. However, English was then added to the mix, and was made a co-official language alongside Maltese, with Italian being dropped as official. The English language has since grown in the country and now threatens the status of Maltese. The number of speakers of Italian there has increased from when Italian was official. A trend among the younger generations is to mix English and Italian vocabulary patterns, in making new Maltese words. For example, the Maltese word for library was originally "bibljoteka", but this has since been displaced by "librerija", formed from the English "library", and an Italian-pattern ending. In addition to mixing English with Italian, Maltenglish is a commonly occurring amalgam of English and Maltese. This involves using English words in Maltese sentences, or adding English vocabulary into Maltese. Trends show that English is becoming the language of choice for more and more people, and is transforming the Maltese language.
Guarani, specifically the primary variety known as Paraguayan Guarani (endonym avañe'ẽ [aʋãɲẽˈʔẽ] 'the people's language'), an indigenous language of South America belonging to the Tupi–Guarani family of the Tupian languages, is one of the official languages of Paraguay (along with Spanish), where it is spoken by the majority of the population, and where half of the rural population is monolingual. Guarani is one of the most-widely spoken indigenous languages of the Americas and the only one whose speakers include a large proportion of non-indigenous people. This represents an unique anomaly in the Americas, where language shift towards European colonial languages has otherwise been a nearly universal cultural and identity marker of mestizos (people of mixed Spanish and Amerindian ancestry), and also of culturally assimilated, upwardly mobile Amerindian people.
Paraguayan Guarani has been used throughout Paraguayan history as a symbol of nationalistic pride. Populist dictators such as José Gaspar Rodríguez de Francia and Alfredo Stroessner used the language to appeal to common Paraguayans, and upon the advent of Paraguayan democracy in 1992, Guarani was enshrined in the new constitution as a co-equal language along with Spanish.  Jopara, the mixture of Spanish and Guarani, is spoken by an estimated 90% of the population of Paraguay. Code-switching between the two languages takes place on a spectrum where more Spanish is used for official and business-related matters, whereas more Guarani is used in art and in everyday life.
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Another example would be the gradual death of the Kinaray-a language of Panay as many native speakers especially in the province of Iloilo are switching to Hiligaynon or mixing the two languages together. Kinaray-a was once spoken in the towns outside the vicinity of Iloílo City, while Hiligaynon was limited to only the eastern coasts and the city proper. However, due to media and other factors such as urbanization, many younger speakers have switched from Kinaray-a to Hiligaynon, especially in the towns of Cabatuan, Santa Barbara, Calinog, Miagao, Passi City, Guimbal, Tigbauan, Tubungan, etc. Many towns, especially Janiuay, Lambunao, and San Joaquin still have a sizeable Kinaray-a-speaking population, with the standard accent being similar to that spoken in the predominantly Karay-a province of Antique. Even in the province of Antique, "Hiligaynization" is an issue to be confronted as the province, especially the capital town of San José de Buenavista, undergoes urbanisation. Many investors from Iloílo City bring with them Hiligaynon-speaking workers who are reluctant to learn the local language.
One of the problems of Kinaray-a is its written form, as its unique "schwa sound" is difficult to represent in orthography. As time goes by, Kinaray-a has disappeared in many areas it was once spoken especially in the island of Mindoro and only remnants of the past remain in such towns as Pinamalayan, Bansud, Gloria, Bongabong, Roxas, Mansalay, and Bulalacao in Oriental Mindoro and Sablayan, Calintaan, San Jose, and Magsaysay in Occidental Mindoro, as Tagalog has become the standard and dominantly recognised official language of these areas.
After Singapore's independence in 1965, there was a general language shift in the country's interracial lingua franca from Malay to English, as English was chosen as the first language for the country. Among the Chinese community in Singapore, there was a language shift from the various dialects of Chinese to English and Mandarin Chinese. Until the 1980s, Singaporean Hokkien was the lingua franca of Chinese community in Singapore, which has since been replaced with English and Mandarin today. There has been a general language attrition in the use of Chinese other than Mandarin Chinese, especially amongst the younger segments of the Singaporean population.
The progressive dominion exerted by the Kingdom of Castile over Spain in as much as it gained political power throughout centuries, contributed to the expansion of its language at the expenses of the rest. The accession of the Castilian House of Trastamara to the Crown of Aragon by mid-15th century saw the gradual displacement of the royal languages of the Crown of Aragon, Aragonese and Catalan, despite the prolific Valencian literature in Catalan in this period. Nebrija's Gramatica castellana (1492), sponsored by the new Spanish monarch Ferdinand II of Aragon, was meant to help expand Castilian, "the companion of the Empire". As the Crown of Castile expanded, its different governmental officials at different levels required their subjects to use or understand Castilian and sideline other vulgar languages, or vernaculars. It often meant the use of interpreters in lawsuits, which could tilt the outcome of the case one side or the other, e.g. the Basque witch trials, and the increased use of Castilian in assemblies and decision-making bodies, and documents, despite not being the commonly understood language in a number of areas, like most of the Basque districts (Navarre, Álava, etc.), Catalonia, Galicia, Asturias, parts of Aragon, etc.
As Aragonese retreated to the sub-Pyrenean valleys, Arabic vanished by the early 17th century, when forced cultural assimilation of the Moriscos was coupled with expulsion (completed in 1614). The arrival of the Bourbons (1700) intensified the centralization of governmental structures and the imposition of Castilian as the only language for official purposes, replacing in 1716 Catalan as the language of Justice Administration in the relevant territories (Nueva Planta Decrees). Unlike Catalan, Basque was never a language written on official documents, but was equally affected. It lost ground to Castilian in all its buffer geographic areas, as well as main institutions as a communication language, after a number of decrees and orders established Castilian as "the national language of the Empire" during Charles III's reign; printing in languages other than Spanish was forbidden (1766), and Castilian was the only language taught in school (1768).
The Peninsular War was followed by the centralization of Spain (Constitutions of 1812, 1837, 1845, 1856, etc.), with only the Basque districts keeping a separate status until 1876. Compulsory education in 1856 made the use of Castilian (Spanish) mandatory, as well as discouraging and forbidding the use of other languages on a number social and institutional settings. Franco and his nationalist dictatorship imposed Spanish as the only valid language for any formal social interaction (1937). By the early 21st century, Spanish was the overwhelmingly dominant language in Spain, with Basque, Catalan, and Galician surviving and developing in their respective regions with different levels of recognition since 1980. Other minorized languages (Asturian, Aragonese) have also seen some recognition in the early 21st century. Catalan, sharing with Basque a strong link between language and identity, enjoys a fairly sound status. Basque competence levels have picked up during the last decades, but everyday use does not go up accordingly. Asturian has been classified by the Endangered Languages Project as being at risk, and Aragonese as an endangered language.
Taiwanese aborigines used only Austronesian languages before other ethnic groups conquered Taiwan. After widespread migration of Han peoples from the 17th to the 19th century, many Taiwanese Plains Aborigines became Sinicized, and shifted their language use to other Sinitic tongues, (mainly Taiwanese Hokkien). Additionally, some Hakka people (a Han Chinese ethnic subgroup) also shifted from Hakka Chinese to Hokkien (also called Hoklo). This happened especially in Yongjing, Changhua, Xiluo, Yunlin, etc. They are called Hoklo-Hakka (Pha̍k-fa-sṳ: Ho̍k-ló-hak, Pe̍h-oē-jī: Hô-ló-kheh, Hanzi: 福佬客).
When Taiwan was under Japanese rule, Japanese became the official language, with the Japanese government promoting Japanese language education. It also led to the creation of Yilan Creole Japanese, a mixture of Japanese, Atayal language, and Hokkien  in Yilan County. In World War II, under the Japanification Movement, Chinese was banned in newspapers and school lectures, and the usage of Japanese at home was encouraged, so many urban people turned to using Japanese. In 1941, 57% of Taiwanese could speak Japanese.
After the ROC government established rule over Taiwan in 1945, it prohibited use of Japanese in newspapers and schools, and promoted the Guoyu movement (Chinese: 國語運動) to popularize Standard Mandarin, often through coercive means. In the primary education system, people using local languages would be fined or forced to put on a dialect card. In the mass media, local languages were also discouraged or prohibited, and some books on the romanization of local languages (e.g. Bibles, lyrics books, Pe̍h-ōe-jī) were banned. In 1975, The Radio and Television Act (Chinese: 廣播電視法) was adopted, restricting the usage of local languages on the radio or TV. In 1985, after the draft of the Language and Script Law (Chinese: 語文法) was released by the Ministry of Education, it received considerable opposition because it banned the use of Taiwanese unofficial languages in the public domain. In response, some Hakka groups demonstrated to save their language. After 1987 when martial law was lifted, the Guoyu movement ceased.
The shift towards monolingual Mandarin was more pronounced among Hakka-speaking communities, attributed to Hakka's low social prestige. Before the KMT took over the island from Japan, the Hakka were expected to learn both Hokkien and Japanese. However, the lack of a significant Japanese-speaking base for gaining and then retaining Japanese fluency meant that most Hakka learned only Hokkien. When the KMT fled to Taiwan from mainland China, most mainlanders settled mainly in northern Taiwan, close to Hakka-speaking areas, thus spurring a linguistic shift from Hokkien to Mandarin within the Taipei area. As the bulk of economic activity centered around patronage networks revolving around Mandarin-speaking KMT membership, most of the Hakka became Mandarin monolinguals, due to a shift in social mobility previously centered around Hokkien. Elsewhere, although the percentage of the Hokkien-speaking population declined in relation to its proportion of the population, most Hokkien-speaking households have retained fluency in Hokkien, helped by the liberalization of Taiwanese politics and the end of martial law.[specify]
Nevertheless, Taiwanese Mandarin has become the most common language in Taiwan today, and the most common home language of Taiwanese youth. In the population census of 2010, Mandarin is the most common home language in the Taipei metropolitan area, Taoyuan, Matsu, aboriginal areas, some Hakka-majority areas, as well as some urban areas of Taichung and Kaohsiung. Conversely, the ability of Taiwanese to speak ethnic languages is strikingly on the decline.
- Scottish Gaelic
Gaelic has long suffered from its lack of use in educational and administrative contexts and was long suppressed. The shift from Gaelic to Scots and Scottish English has been ongoing since about 1200 CE; Gaelic has gone from being the dominant language in almost all areas of modern-day Scotland to an endangered language spoken by only about 1% of the population.
With the advent of devolution, however, Scottish Gaelic has begun to receive greater attention, and it has achieved a degree of official recognition when the Gaelic Language (Scotland) Act was enacted by the Scottish Parliament on 21 April 2005. Gaelic medium education in Scotland now enrolls over 2000 pupils a year. Nevertheless, the number of native speakers continues to decline and it is a minority language in most of the traditional Gàidhealtachd, including all census areas outside of the Outer Hebrides.
Cockney English, traditionally spoken by working-class Londoners has been predicted to be replaced by Multicultural London English (MLE) or 'Jafaican' within 30 years as Cockneys move out of London. The new language is theorised to have emerged as new migrants spoke their own forms of English such as Nigerian and Indian and contains elements from "learners’ varieties" as migrants learn English as a second language.
Although English has been the majority language in the United States since independence in 1776, other languages were spoken first in large areas of the country. In addition to hundreds of aboriginal languages, French was once the primary language in Louisiana, Missouri, and areas along the border with Quebec, but the speaking has diminished due to new waves of migration and the rise of English as a lingua franca. Californio Spanish rapidly became a minority language during the mass immigration that took place during the California Gold Rush, and has largely been supplanted by English and Mexican Spanish, surviving mainly as a prestige dialect in Northern and Central California. German was once the primary language in large areas of the Great Plains and Pennsylvania, but was suppressed due to anti-German sentiment during the First World War.
Since the fall of Saigon at the end of the Vietnam War in 1975, French has declined heavily in Vietnam from being a government language and primary language of education in South Vietnam to being a minority language limited to the elite classes and elderly population. Today, French is spoken fluently by only slightly over 5% of the Vietnamese population. The language shift from French to Vietnamese occurred earlier in the north due to Viet Minh and later communist policies enforcing Vietnamese as the sole language for political and educational purposes. However, since the late 1990s, there has been a minor revival of French in Vietnam.
American linguist Joshua Fishman has proposed a method of reversing language shift which involves assessing the degree to which a particular language is disrupted in order to determine the most effective way of assisting and revitalising the language.
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