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Multilateralism was defined by Miles Kahler as "international governance" or global governance of the "many," and its central principle was "opposition [to] bilateral discriminatory arrangements that were believed to enhance the leverage of the powerful over the weak and to increase international conflict*.
 "International conflict still includes the old-fashioned war, a violent confrontation between nation states acting through their own armed forces or proxies with at least one state fighting outside its borders. But now some conflicts are treated as threats to international peace and security even if two states are not fighting. Particularly when internal conflicts involve violations of universal norms such as self-determination, human rights, or democratic governance, concerted international actions—including the threat or use of force—are being taken to prevent, conclude, or resolve them just as they sometimes have been for old-fashioned wars. In this sense some conflicts within a country’s borders are being treated as international."'
ref>Stern, Paul. C. "international conflict resolution after the cold war (2000)". https://www.nap.edu/read/9897/chapter/2. The National Academies Press. External link in
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In 1990, Robert Keohane defined multilateralism as "the practice of coordinating national policies in groups of three or more states." The foreign policy that India formulated after independence reflected her idiosyncratic culture and politic traditions. Speaking in the Lok Sabha, the lower house of the Parliament of India, in March 1950, Nehru affirmed: “It should not be supposed that we are starting on a clean slate. It is a policy which flowed from our recent history and from our national movement and its development and from various ideals we have proclaimed. (Nehru, 1961, p.34). In fact, the foreign policy culture of India is an elite culture, meaning, in effect, that the writings and speeches of select leading figures of the Indian foreign policy elite provide an insight into the key ideas and norms constituting the foundation of India’s foreign policy.
John Ruggie elaborated the concept based on the principles of "indivisibility" Indivisible is a progressive movement in United States politics, initiated in 2016 as a reaction to the election of Donald Trump as President of the United States. The movement began with the online publication of a handbook written by Congressional staffers with suggestions for peacefully but effectively resisting the move to the right in the executive branch of the United States government under the Trump administration that was widely anticipated and feared by progressives  and "diffuse reciprocity (international relations)I think'reciprocity' is somewhat unequal term. It seems like upper-level state giving sth in terms of generosity to the lower state -->" as "an institutional form which coordinates relations among three or more states on the basis of 'generalized' principles of conduct ... which specify appropriate conduct for a class of actions, without regard to particularistic interests of the parties or the strategic exigencies that may exist in any occurrence." serves to bind powerful nations, discourage unilateralism, and gives small powers a voice and influence that they could not otherwise exercise. For a small power to influence a great power, the Lilliputian strategy of small countries banding together to collectively bind a larger one can be effective. Similarly, multilateralism may allow one great power to influence another great power. For a great power to seek control through bilateral ties could be costly; it may require bargaining and compromise with the other great power.
Embedding the target state in a multilateral alliance reduces the costs borne by the power seeking control, but it also offers the same binding benefits of the Lilliputian strategy. Furthermore, if a small power seeks control over another small power, multilateralism may be the only choice, because small powers rarely have the resources to exert control on their own. As such, power disparities are accommodated to the weaker states by having more predictable bigger states and means to achieve control through collective action. Powerful states also buy into multilateral agreements by writing the rules and having privileges such as veto power and special status.
International organizations, such as the United Nations (UN) and the World Trade Organization, are multilateral in nature. The main proponents of multilateralism have traditionally been the middle powers, such as Canada, Australia, Switzerland, the Benelux countries and the Nordic countries. Larger states often act unilaterally, while smaller ones may have little direct power in international affairs aside from participation in the United Nations (by consolidating their UN vote in a voting bloc with other nations, for example.) Multilateralism may involve several nations acting together, as in the UN, or may involve regional or military alliances, pacts, or groupings, such as NATO. These multilateral institutions are not imposed on states, but are created and accepted by them in order to increase their ability to seek their own interests through the coordination of their policies. Moreover, they serve as frameworks that constrain opportunistic behavior and encourage coordination by facilitating the exchange of information about the actual behavior of states with reference to the standards to which they have consented. "The liberal conception of control differs from the powerplay conception regarding who seeks control over whom. As a rule, multilateralism is the preferred strategy for exercising control over another country, but it depends on the situation. The potential range of situations. If control is sought by a small power over a great power, then the Lilliputian strategy of small countries achieving control by collectively binding the great power is likely to be most effective. Multilateral constraints, whether in the form of membership in an alliance or in international institutions, are necessary to bind the great power, discourage unilateralism, and give the small powers a voice and voting opportunities that they would not otherwise have.24 Similarly, if control is sought by a great power over another great power, then multilateral controls may be most useful. The great power could seek control through bilateral ties, but this would be costly; it also would require bargaining and compromise with the other great power. Embedding the target state in a multilateral alliance reduces the costs borne by the power seeking control, but it also offers the same binding benefits of the Lilliputian strategy. If a small power seeks control over another small power, multilateralism may be the only choice, because small powers rarely have the resources to exert control on their own." 
The term "regional multilateralism" has been proposed, suggesting that "contemporary problems can be better solved at the regional rather than the bilateral or global levels" and that bringing together the concept of regional integration with that of multilateralism is necessary in today’s world. Regionalism dates from the time of the earliest development of political communities, where economic and political relations naturally had a strong regionalist focus due to restrictions on technology, trade, and communications. In international relations, regionalism is the expression of a common sense of identity and purpose combined with the creation and implementation of institutions that express a particular identity and shape collective action within a geographical region. Regionalism is one of the three constituents of the international commercial system (along with multilateralism and unilateralism)  The converse of multilateralism is unilateralism, in terms of political philosophy.
One modern instance of multilateralism occurred in the nineteenth century in Europe after the end of the Napoleonic Wars, where the great powers met to redraw the map of Europe at the Congress of Vienna (November 1814 to June 1815). The Concert of Europe, as it became known, was a group of great and lesser powers that would meet to resolve issues peacefully. Conferences such as the Conference of Berlin in 1884 helped reduce power conflicts during this period, and the 19th century was one of Europe's most peaceful.The Napoleonic Wars (1803–1815) were a series of major conflicts pitting the French Empire and its allies, led by Napoleon I, against a fluctuating array of European powers formed into various coalitions, financed and usually led by the United Kingdom. The wars stemmed from the unresolved disputes associated with the French Revolution and its resultant conflict. The wars are often categorised into five conflicts, each termed after the coalition that fought Napoleon: the Third Coalition (1805), the Fourth (1806–07), Fifth (1809), Sixth (1813), and the Seventh and final (1815). 
Industrial and colonial competition, combined with shifts in the balance of power after the creation - by diplomacy and conquest - of Germany by Prussia meant cracks were appearing in this system by the turn of the 20th century. The concert system was utterly destroyed by the First World War. After that conflict, world leaders created the League of Nations (which became the precursor of the United Nations) in an attempt to prevent a similar conflict. Multilateral arms limitation treaties were agreed, such as the Kellogg-Briand Pact. But the League proved insufficient to prevent Japan's conquests in Eastern Asia in the 1930s, escalating German aggression and, ultimately, the Second World War.
After the Second World War the victors, drawing upon experience from the League's failure, created the United Nations in 1945. Since then, the "breadth and diversity" of multilateral arrangements have escalated. Unlike the League, the UN had the active participation of the United States and the Soviet Union, the world's then greatest contemporary powers. Along with the political institutions of the UN, the post-war years also saw the development of organizations such as the General Agreement on Tariffs and Trade (GATT) (now the World Trade Organization), the World Bank (so-called 'Bretton Woods' institutions) and the World Health Organization. Formation of these subsequent bodies under the United Nations made it more powerful than the League. The multilateral framework played an important role in maintaining world peace in the Cold War. Moreover, United Nations peacekeepers stationed around the world became a visible symbol of multilateralism.
Multilateral institutions of varying scope and subject matter range from the International Telecommunications Union (ITU) to the World Intellectual Property Organization (WIPO) and Organisation for the Prohibition of Chemical Weapons (OPCW).
The multilateral system has encountered mounting challenges since the end of the Cold War.
The United States became increasingly dominant in terms of military and economic power, which has led countries such as Iran, China and India to question the UN's relevance. Concurrently, a perception developed among internationalists such as former UN Secretary-General Kofi Annan, that the United States is more inclined to act unilaterally in situations with international implications. This trend began when the U.S. Senate, in October 1999, refused to ratify the Comprehensive Test Ban Treaty The Comprehensive Nuclear-Test-Ban Treaty (CTBT) is a multilateral treaty that bans all nuclear explosions, for both civilian and military purposes, in all environments. It was adopted by the United Nations General Assembly on 10 September 1996, but has not entered into force, as eight specific states have not ratified the treaty., which President Bill Clinton had signed in September 1996. Under President George W. Bush the United States rejected such multilateral agreements as the Kyoto Protocol, the International Criminal Court, the Ottawa Treaty banning anti-personnel land mines and a draft protocol to ensure compliance by States with the Biological Weapons Convention. Also under the George W. Bush administration, the United States withdrew from the Anti-Ballistic Missile Treaty, which the Richard Nixon administration and the Soviet Union had signed in 1972.
These challenges presented by the U.S could be explained by a strong belief in bilateral alliances as instruments of control. Liberal institutionalists would argue, though, that great powers might still opt for a multilateral alliance. But great powers can amplify their capabilities to control small powers and maximize their leverage by forging a series of bilateral arrangements with allies, rather than see that leverage diluted in a multilateral forum. Arguably, the Bush administration favored bilateralism over multilateralism, or even unilateralism, for similar reasons. Rather than going it alone or going it with others, the administration opted for intensive one-on-one relationships with handpicked countries that maximized the U.S. capacity to achieve its objectives.
Another challenge in global governance through multilateralism involves national sovereignty. Regardless of the erosion of nation-states' legal and operational sovereignty in international relations, "nation-states remain the ultimate locus of authoritative decision making regarding most facets of public and private life". Hoffman asserted that nation-states are "unlikely to embrace abstract obligations that clash with concrete calculations of national interest."
Global multilateralism is challenged, particularly with respect to trade, by regional arrangements such as the European Union and NAFTA, although these are not in themselves incompatible with larger accords. The original sponsor of post-war multilateralism in economic regimes, the United States, turned towards unilateral action and in trade and other negotiations as a result of dissatisfaction with the outcomes of multilateral fora. As the most powerful nation, the United States had the least to lose from abandoning multilateralism; the weakest nations have the most to lose, but the cost for all would be high.
Comparison with bilateralismEdit
When enacting foreign policies, governments face a choice between unilateralism, bilateralism and multilateralism.
Bilateralism means coordination with another single country. Multilateralism has attempted to find common ground based on generalized principles of conduct, in addition to details associated with a particular agreement. Victor Cha argued that: power asymmetries predict the type of structures, bilateral or multilateral, that offer the most control. If small powers try to control a larger one, then multilateralism is effective. But if great powers seek control over smaller ones, bilateral alliances are more effective.
Thus, a country's decision to select bilateralism or multilateralism when enacting foreign policies is greatly affected by its size and power, as well as the size and power of the country over which it seeks control. Take the example of Foreign Policy of the United States. Many references discuss how the United States interacts with other nations. In particular, the United States chose multilateralism in Europe and decided to form NATO, while it formed bilateral alliances, or the Hub and spokes architecture, in East Asia.The San Francisco System (also known as the "Hub and Spokes" architecture) is a network of bilateral alliance pursued by the United States in East Asia, after the end of the World War II - the United States as a 'hub', and Japan, South Korea, the Philippines, Taiwan, and Australia as 'spokes'. The system is made of political-military and economic commitments between the United States and its Pacific allies. It allowed the United States to develop exclusive postwar relationships with the Republic of Korea (ROK), the Republic of China (ROC or Taiwan), and Japan. These treaties are an example of bilateral collective defense. Since the system emerged under the U.S powerplay rationale, it is the most dominant security architecture in East Asia up to now. Although there are many arguments about the reasons for this, Cha's "powerplay" theory provides one possible reason. He argued:
...postwar U.S planners had to contend with a region uniquely constituted of potential rogue allies, through their aggressive behavior, could potentially entrap the United States in an unwanted wider war in Asia. ... To avoid this outcome, the United States created a series of tight, deep bilateral alliances with Taiwan, South Korea, and Japan through which it could exercise maximum control and prevent unilateral aggression. Furthermore, it did not seek to make these bilateral alliances multilateral, because it wanted to amplify U.S. control and minimize any collusion among its partners.
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- Kahler,Miles. "Multilateralism with Small and Large Numbers." International Organization, 46, 3 (Summer 1992),681.
- Keohane, Robert O. "Multilateralism: An Agenda for Research." International Journal, 45 (Autumn 19901), 731.; see for a definition of the special features of "regional multilateralism" Michael, Arndt (2013). India's Foreign Policy and Regional Multilateralism (Palgrave Macmillan), pp. 12-16.
- Ardnt, Michael (2013). India's Foreign Policy and Regional Multilateralism (1 ed.). London, UK: Palgrave Macmillan UK. Retrieved 1 October 2018.
- https://en.wikipedia.org/wiki/Indivisible_movement. Missing or empty
- John Ruggie, "Multilateralism: the anatomy of an institution,"International Organization, 46:3, summer 1992, pp 561-598.
- Cha, Victor D (2009). "Powerplay Origins of the U.S. Alliance System in Asia". The MIT Press. 3.
- Harris Mylonas and Emirhan Yorulmazlar, "Regional multilateralism: The next paradigm in global affairs", CNN, January 14, 2012.
- Andrew Hurrell, "One world, many worlds: the place of regions in the study of international society," International Affairs, 83:1, 2007, pp 127-146.
- "Regionalism (international relations)". Wikipedia. Retrieved 2 October 2018.
- Adogame, Afe (2004). "The Berlin-Congo Conference 1884: The Partition of Africa and Implications for Christian Mission Today". Journal of Religion in Africa. 34 (1/2): 188.
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- "Comprehensive Nuclear Test Ban Treaty". wikipedia. Retrieved 2 October 2018.
- Cha, Victor D. "Powerplay: Origins of the US alliance system in Asia." International Security 34.3 (2010):166-167
- Stanley Hoffmann, “World governance: beyond utopia,” Daedalus, 132:1, pp 27-35.
- Iain McLean; Alistair McMillan (26 February 2009). The Concise Oxford Dictionary of Politics. OUP Oxford. p. 519. ISBN 978-0-19-101827-5.
- Cha, Victor D. "Powerplay: Origins of the US alliance system in Asia." International Security 34.3 (2010): 165-166
- "San Fransisco System". wikipedia. Retrieved 2 October 2018.
- Edward Newman, Ramesh Rhakur and John Tirman, 2006, Multilateralism Under Challenge, Tokyo: United Nations Press.
- Michale Yahuda, The International Politics of the Asia-Pacific, New York: Routledge, 2011.
- Rorden Wilkinson, Multilateralism and the World Trade Organisation: The Architecture and Extension of International Trade Regulation, New York: Routledge, 2000.