What happened on 20 April?

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

1. 1889 Born: Adolf Hitler Nazi dictator of Germany; instigated WWII and the Holocaust.
2. 1808 Born: Napoleon III Nephew of Napoleon I; president then emperor of France; rebuilt Paris and led France into the Franco-Prussian War.
3. 2010 Deepwater Horizon oil spill Largest marine oil spill in history.
4. 1653 Cromwell expels the Rump Parliament Out of patience with the remnant of the Long Parliament, Cromwell marches musketeers into the Commons and clears the chamber himself — 'you have sat too long here for any good you
5. 1792 Revolutionary France declares war on Austria Girondin ministers convince the Legislative Assembly that war will expose traitors and export liberty; Austria and Prussia expect a short march on Paris. It is the start of twenty-
6. 1968 Pierre Trudeau's first premiership Trudeaumania, official bilingualism, the October Crisis and the War Measures Act.
7. 1999 Columbine High School massacre Two students kill 13 at their Colorado school, seared into US culture as the archetype of the modern school shooting.
8. 1949 Crossing of the Yangtze Communist forces cross the Yangtze and capture Nanjing, the Nationalist capital.
9. 1920 Olympic Games return after WW1 Antwerp 1920 Olympics — first after WW1 hiatus.
10. 2023 Starship's first integrated flight The largest rocket ever flown clears the pad and tumbles; within two years its boosters are being caught in mid-air by the launch tower's arms.
11. 1876 April Uprising in Bulgaria A doomed Bulgarian revolt is drowned in blood at Batak and elsewhere; Gladstone's pamphlet on the 'Bulgarian Horrors' turns Europe against the Ottomans.
12. 1968 Enoch Powell delivers the Rivers of Blood speech In Birmingham, Enoch Powell prophesies racial catastrophe from Commonwealth immigration — 'like the Roman, I seem to see the River Tiber foaming with much blood'. Heath sacks him w