1836 – Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.
1898 – Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.
1911 – Ivan Combe, American businessman, developed Clearasil (d. 2000) is born.
1934 – The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1999, it is revealed to be a hoax).
1947 – Iggy Pop, American singer-songwriter, producer, and actor is born.
1952 – Secretary's Day (now Administrative Professionals' Day) is first celebrated.
1962 – The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the United States since World War II.
1965 – The 1964–1965 New York World's Fair opens for its second and final season.
1980 – Tony Romo, American football player is born.
1982 – Baseball: Rollie Fingers of the Milwaukee Brewers becomes the first pitcher to record 300 saves.
1989 – Tiananmen Square protests of 1989: In Beijing, around 100,000 students gather in Tiananmen Square to commemorate Chinese reform leader Hu Yaobang.
1992 – The first discoveries of extrasolar planets are announced by astronomers Aleksander Wolszczan and Dale Frail. They discovered two planets orbiting the pulsar PSR 1257+12.
2003 – Nina Simone, American singer-songwriter, pianist, and activist (b. 1933) dies.
2012 – Charles Colson, American lawyer and activist, founded Prison Fellowship (b. 1931) dies.
2016 – Prince, American singer-songwriter, guitarist, producer, and actor (b. 1958) dies.