April 30 events in history

311 The Diocletianic Persecution of Christians in the Roman Empire ends
313 Battle of Tzirallum: Emperor Licinius defeats Maximinus II and unifies the Eastern Roman Empire
642 Chindasuinth is proclaimed king by the Visigothic nobility and bishops
1315 Enguerrand de Marigny is hanged on the public gallows at Montfaucon
1492 Spain gives Christopher Columbus his commission of exploration
1513 Edmund de la Pole, Yorkist pretender to the English throne, is executed on the orders of Henry VIII
1557 Mapuche leader Lautaro is killed by Spanish forces at the Battle of Mataquito in Chile
1598 Juan de Oñate makes a formal declaration of his Conquest of New Mexico
1636 Eighty Years' War: Dutch Republic forces recapture a strategically important fort from Spain after a nine-month siege
1671 Petar Zrinski, the Croatian Ban from the Zrinski family, is executed
1789 On the balcony of Federal Hall on Wall Street in New York City, George Washington takes the oath of office to become the first elected President of the United States
1803 Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling the size of the young nation
1812 The Territory of Orleans becomes the 18th U.S. state under the name Louisiana
1838 Nicaragua declares independence from the Central American Federation
1863 A 65-man French Foreign Legion infantry patrol fights a force of nearly 2,000 Mexican soldiers to nearly the last man in Hacienda Camarón, Mexico
1871 The Camp Grant massacre takes place in Arizona Territory
1885 Governor of New York David B. Hill signs legislation creating the Niagara Reservation, New York's first state park, ensuring that Niagara Falls will not be devoted solely to industrial and commercial use
1894 Coxey's Army reaches Washington, D.C. to protest the unemployment caused by the Panic of 1893
1900 Hawaii becomes a territory of the United States, with Sanford B. Dole as governor
1900 Casey Jones dies in a train wreck in Vaughan, Mississippi, while trying to make up time on the Cannonball Express
1904 The Louisiana Purchase Exposition World's Fair opens in St. Louis, Missouri
1907 Honolulu, Hawaii becomes an independent city
1920 Peru becomes a signatory to the Buenos Aires copyright treaty
1925 Automaker Dodge Brothers, Inc is sold to Dillon, Read & Co. for US$146 million plus $50 million for charity
1927 The Federal Industrial Institute for Women opens in Alderson, West Virginia, as the first women's federal prison in the United States
1927 Douglas Fairbanks and Mary Pickford become the first celebrities to leave their footprints in concrete at Grauman's Chinese Theater in Hollywood
1937 The Philippines holds a plebiscite for Filipino women on whether they should be extended the right to suffrage; over 90% would vote in the affirmative
1938 The animated cartoon short Porky's Hare Hunt debuts in movie theaters, introducing Happy Rabbit (a prototype of Bugs Bunny)
1938 The first televised FA Cup Final takes place between Huddersfield Town and Preston North End
1939 The 1939-40 New York World's Fair opens
1939 NBC inaugurates its regularly scheduled television service in New York City, broadcasting President Franklin D. Roosevelt's N.Y. World's Fair opening day ceremonial address
1943 World War II: Operation Mincemeat: The submarine HMS Seraph surfaces in the Mediterranean Sea off the coast of Spain to deposit a dead man planted with false invasion plans and dressed as a British military intelligence officer
1945 World War II: Führerbunker: Adolf Hitler and Eva Braun commit suicide after being married for one day. Soviet soldiers raise the Victory Banner over the Reichstag building
1947 In Nevada, the Boulder Dam is renamed the Hoover Dam a second time
1948 In Bogotá, Colombia, the Organization of American States is established
1953 In Warner Robins, Georgia, an F4 tornado kills 18 people
1956 Former Vice President and Senator Alben Barkley dies during a speech in Virginia. He collapses after proclaiming "I would rather be a servant in the house of the lord than sit in the seats of the mighty."
1961 K-19, the first Soviet nuclear submarine equipped with nuclear missiles, is commissioned
1963 The Bristol Bus Boycott is held in Bristol to protest the Bristol Omnibus Company's refusal to employ Black or Asian bus crews, drawing national attention to racial discrimination in the United Kingdom
1966 The Church of Satan is established at the Black House in San Francisco
1967 The Aldene Connection opened in Roselle Park, NJ, shutting down the CNJ's Jersey City waterfront terminal and transferring commuters to Newark Penn Station
1973 Watergate scandal: U.S. President Richard Nixon announces that top White House aides H. R. Haldeman, John Ehrlichman and others have resigned
1975 Fall of Saigon: Communist forces gain control of Saigon. The Vietnam War formally ends with the unconditional surrender of South Vietnamese president Dương Văn Minh
1980 Beatrix becomes Queen of the Netherlands
1980 The Iranian Embassy siege begins in London
1982 The Bijon Setu massacre occurs in Calcutta
1993 CERN announces World Wide Web protocols will be free
1993 Monica Seles is stabbed by Günter Parche, an obsessed fan, during a quarterfinal match of the 1993 Citizen Cup in Hamburg, Germany
1994 Formula One racing driver Roland Ratzenberger is killed in a crash during the qualifying session of the San Marino Grand Prix run at Autodromo Enzo e Dino Ferrari outside Imola, Italy
1995 U.S. President Bill Clinton becomes the first President to visit Northern Ireland