1805 – Napoleon Bonaparte was crowned king of Italy.
1864 – Montana is organized as a territory.
1868 – The impeachment trial of President Andrew Johnson ended with his acquittal as the Senate fell one vote short of the two-thirds majority required for conviction.
1940 – The evacuation of Allied troops from Dunkirk, France, began during World War II.
1972 – President Richard M. Nixon and Soviet leader Leonid Brezhnev signed the Anti-Ballistic Missile Treaty in Moscow.
2009 – California’s Supreme Court upheld the Proposition 8 gay marriage ban but said the 18,000 same-sex weddings that had taken place before the prohibition passed were still valid.