Wikipedia:Selected anniversaries/June 1
- 1670 – Charles II and Louis XIV signed a secret treaty, requiring England to aid France in its war against the Dutch Republic and the future conversion of Charles to Catholicism, in return for Louis making large payments to Charles and promising to aid him if there was a rebellion in England.
- 1831 – An expedition led by British naval officer and explorer James Clark Ross (pictured) reached the North Magnetic Pole, the first to do so.
- 1868 – The Navajo and the U.S. government signed an agreement, allowing those interned at Fort Sumner to return to their ancestral lands.
- 1988 – The Intermediate-Range Nuclear Forces Treaty came into effect, banning all American and Soviet land-based missiles with a range of 500 to 5,500 km (310 to 3,420 mi).
- 2015 – The cruise ship Dongfang zhi Xing capsized in the Yangtze river, resulting in 442 deaths, China's worst peacetime maritime disaster.