THIS DAY IN HISTORY

661
The Rashidun Caliphate ends with death of Ali.
1695
Mustafa II becomes the Ottoman sultan in Istanbul on the death of Ahmed II. Mustafa rules until his abdication in 1703.
1927
Ibn Saud takes the title of King of Nejd.
1944
World War II: The 900-day Siege of Leningrad is lifted.
1967
The United States, United Kingdom, and Soviet Union sign the Outer Space Treaty in Washington, D.C., banning deployment of nuclear weapons in space, and limiting use of the Moon and other celestial bodies to peaceful purposes.
1973
The Paris Peace Accords officially end the Vietnam War. Colonel William Nolde is killed in action becoming the conflict's last recorded American combat casualty.