The events happened on 20th April are :



1968: Trudeau sworn in as prime minister of Canada : Pierre Elliott Trudeau of the Liberal Party, who became prime minister of Canada this day in 1968, discouraged the French separatist movement, oversaw the formation of a new constitution, and established relations with China.



1999: Two disgruntled and heavily armed students entered Columbine High School in Littleton, Colorado, and murdered 13 people before killing themselves.



1924: Finalizing the dissolution of the Ottoman Empire, Turkey's Grand National Assembly voted to adopt a full republican constitution, with General Mustafa Kemal, who had first proclaimed the Turkish republic about six months earlier, becoming the first president of the republic.



1920: U.S. Supreme Court Justice John Paul Stevens was born in Chicago.



1919: In an ongoing dispute over the possession of Vilnius, Polish forces drove out Russia's Red Army—which had previously ousted the newly established Lithuanian government—and occupied the city.



1871: Japan's first government-operated postal service opened between Tokyo and Ōsaka.



1840: French Symbolist painter Odilon Redon was born in Bordeaux.



1808: Napoleon III, president of the Second Republic (1850–52) and emperor of France (1852–70), was born in Paris.



1653: England's Rump Parliament was dissolved by Oliver Cromwell and later replaced by the nominated Barebones Parliament, which was dissolved in the same year, leading to the declaration of the Protectorate.



19th April | 21st April