Wikipedia:Selected anniversaries/May 12
May 12: World Fair Trade Day (2007); International Nurses Day
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- 1551 - National University of San Marcos, the oldest university in South America, was founded in Lima, Peru.
- 1885 - North-West Rebellion: Louis Riel and the Métis rebels were decisively defeated in the Battle of Batoche by Canadian forces under Major-General Frederick Middleton.
- 1926 - A general strike by the trade unions in the United Kingdom ended after nine days.
- 1941 - German engineer Konrad Zuse (pictured) presented the Z3, the world's first working programmable, fully automatic computer, in Berlin.
- 1975 - The Cambodian navy seized the American merchant ship SS Mayagüez in international waters.