Wikipedia:Selected anniversaries/September 17
September 17: Citizenship Day in the United States
- 1787 - The text of the United States Constitution was finalized in Philadelphia.
- 1809 - The Treaty of Fredrikshamn concluded the Finnish War between Russia and Sweden, with Finland becoming an autonomous Grand Duchy under Czar 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).
Recent days: September 16 – September 15 – September 14
More anniversaries: