Historical Events on September 20

Battle of Alma — 1854 first battle of the Crimean War

Battle of Chickamauga — 1863 battle of the American Civil War

Capture of Rome — Final event of Italian unification (1870)

1969 Canadian Grand Prix — Formula One motor race held in 1969

1970 Canadian Grand Prix — Formula One motor race held in 1970

Treaty on the Prohibition of Nuclear Weapons — legally binding international agreement to prohibit nuclear weapons