What happened on 17 April?

8 events from the Ever-When timeline, ranked by how much they mattered.

1. 1975 Khmer Rouge regime Pol Pot's regime murders roughly a quarter of Cambodia's population.
2. 1961 Bay of Pigs invasion CIA-backed Cuban exile force is routed at the Bay of Pigs; embarrassment for Kennedy.
3. 1975 Khmer Rouge takes Phnom Penh Pol Pot's Khmer Rouge enters Phnom Penh; empties cities; begins genocide that kills 1.5-2 million Cambodians.
4. 1982 Constitution patriated with the Charter The Queen signs Canada's constitution home on a rainy Ottawa day, with a Charter of Rights that remakes Canadian law — and Quebec's signature missing, then and since.
5. 1969 Normalisation: Husák replaces Dubček After anti-Soviet riots over an ice-hockey victory give Moscow its pretext, Dubček is removed and Gustáv Husák begins 'normalisation': half a million purged from the party, a gener
6. 1917 Lenin's April Theses Returning from exile, Lenin demands 'all power to the soviets' and an end to the war, setting the Bolsheviks on the road to the October seizure of power.
7. 1975 Year Zero (evacuation of the cities) The Khmer Rouge empty Cambodia's cities, beginning a radical and deadly agrarian revolution.
8. 1860 Heenan-Sayers prize fight English champion Tom Sayers meets American John C. Heenan at Farnborough in the first great international boxing match — illegal, brutal, 42 rounds, ended by a crowd invasion and d