April 30

Spain formally commissions Christopher Columbus for his westward voyage, naming him admiral of the ocean sea.

Spanish monarchs Ferdinand and Isabella formally commissioned Christopher Columbus for his westward voyage, granting him the titles "admiral of the ocean sea" and viceroy over any territories he might discover, finalizing the arrangements that would send his small fleet across the Atlantic later that year.

King Henry IV of France issues the Edict of Nantes, granting substantial religious freedoms to French Protestants.

King Henry IV of France issued the Edict of Nantes, granting substantial religious toleration and civil rights to French Protestant Huguenots after decades of brutal religious warfare, a landmark act of religious pragmatism that brought relative peace to France until the edict's controversial revocation nearly a century later.

George Washington takes the oath of office at Federal Hall in New York City, becoming the first President of the United States.

George Washington took the presidential oath of office on the balcony of Federal Hall in New York City, becoming the first President of the United States under the newly ratified Constitution and establishing precedents for the peaceful transfer of power that would shape the young republic's political traditions.

The United States completes the Louisiana Purchase, acquiring vast western territory from France for $15 million.

The United States completed the Louisiana Purchase, acquiring roughly 828,000 square miles of French territory west of the Mississippi River for approximately $15 million, one of the largest land acquisitions in history, which effectively doubled the size of the young nation and opened vast new territory for westward expansion.

The Territory of Orleans is admitted to the Union as the state of Louisiana.

The Territory of Orleans was admitted to the Union as the state of Louisiana, becoming the eighteenth U.S. state and the first to be carved from the vast territory acquired in the Louisiana Purchase, bringing a distinctive blend of French, Spanish, and Creole cultural heritage into the American union.

Physicist J.J. Thomson announces his discovery of the electron at the Royal Institution in London.

Physicist J.J. Thomson announced his discovery of the electron at the Royal Institution in London, identifying a subatomic particle with negative charge far smaller than the atom itself, a finding that upended the prevailing view of atoms as indivisible and laid crucial groundwork for the development of modern atomic and particle physics.

Adolf Hitler and Eva Braun commit suicide in the Führerbunker as Soviet forces close in on Berlin.

With Soviet troops just blocks from his underground bunker in Berlin, Adolf Hitler shot himself while Eva Braun, whom he had married the previous day, took cyanide, ending the life of the Nazi dictator responsible for World War II and the Holocaust just as Soviet soldiers raised their flag over the nearby Reichstag.

Saigon falls to North Vietnamese and Viet Cong forces, ending the Vietnam War with South Vietnam's unconditional surrender.

North Vietnamese and Viet Cong forces captured Saigon, the capital of South Vietnam, prompting the government's unconditional surrender and formally ending the Vietnam War, a conflict that had killed millions and profoundly shaped American politics and society over the preceding two decades.

CERN announces that World Wide Web technology will be freely available to everyone, with no fees required.

Physicists at CERN, the European particle physics laboratory, publicly announced that the World Wide Web technology developed there by Tim Berners-Lee would be made freely available to anyone, with no licensing fees required, a decision widely credited with enabling the web's rapid, open global growth in the years that followed.

Automaker Chrysler files for Chapter 11 bankruptcy protection amid the global financial crisis.

American automaker Chrysler filed for Chapter 11 bankruptcy protection amid the global financial crisis, becoming the first major U.S. automaker to do so in decades, a restructuring that involved significant federal government support and an eventual partnership with Italian automaker Fiat to help the company survive.