Wikipedia:Selected anniversaries/September 17
September 17: Constitution Day and Citizenship Day in the United States.
- 1787 - The text of the United States Constitution was finalized in Philadelphia.
- 1809 - The Treaty of Hamina concluded the Finnish War between Russia and Sweden, with Finland becoming an autonomous Grand Duchy under Tsar Alexander I.
- 1894 - The Imperial Japanese Navy and the Beiyang Fleet of Qing China clashed in the Battle of Yalu River, the largest naval engagement of the First Sino-Japanese War.
- 1916 - World War I: "The Red Baron", a flying ace of the German Luftstreitkräfte, won his first aerial combat near Cambrai, France.
- 1978 - President Anwar Sadat of Egypt and Prime Minister Menachem Begin of Israel signed the Camp David Accords after twelve days of secret negotiations at Camp David (pictured with President Jimmy Carter of the United States).
Recent days: September 16 – September 15 – September 14
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