Wikipedia:Selected anniversaries/April 22
On April 22:
- 1836 - Mexican General Santa Anna was captured, ending the Texas Revolution.
- 1914 - Baltimore Orioles' pitcher Babe Ruth played his first professional baseball game.
- 1930 - The London Naval Treaty, regulating submarine warfare and limiting shipbuilding, was signed.
- 1943 - Albert Hofmann wrote his first report about the effects of LSD.
- 1970 - The first Earth Day was celebrated.
- 1992 - Explosions on Guadalajara due to gasoline leak on sewers.