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April 20th
According to Wikipedia and other sources, on April 20th:
1534 – Jacques Cartier begins the voyage during which he discovers Canada and Labrador.
1657 – Freedom of religion is granted to the Jews of New Amsterdam (later New York City).
1775 – American Revolutionary War: the Siege of Boston begins, following the battles at Lexington and Concord.
1836 – U.S. Congress passes an act creating the Wisconsin Territory.
1861 – American Civil War: Robert E. Lee resigns his commission in the United States Army in order to command the forces of the state of Virginia.
1916 – The Chicago Cubs play their first game at Weeghman Park (currently Wrigley Field), defeating the Cincinnati Reds 7-6 in 11 innings.
1972 – Apollo 16, commanded by John Young, lands on the moon.