On this day in history, April 30
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.
1492 – Spain gives Christopher Columbus his commission of exploration.
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.
1900 – Hawaii becomes a territory of the United States, with Sanford B. Dole as governor.
1907 – Honolulu, Hawaii becomes an independent city.
1927 – Douglas Fairbanks and Mary Pickford become the first celebrities to leave their footprints in concrete at Grauman's Chinese Theater in Hollywood.
1938 – The animated cartoon short Porky's Hare Hunt debuts in movie theaters, introducing Happy Rabbit (a prototype of Bugs Bunny).
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.
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.
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."
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 Duong Van Minh.
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 at 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.
2004 – U.S. media release graphic photos of American soldiers abusing and sexually humiliating Iraqi prisoners at Abu Ghraib prison.2008 – Two skeletal remains found near Ekaterinburg, Russia are confirmed by Russian scientists to be the remains of Alexei Nikolaevich, Tsarevich of Russia and Grand Duchess Anastasia Nikolaevna, one of his sisters.2009 – Chrysler files for Chapter 11 bankruptcy.