In History, Today on May 1

Emperor Naruhito ascended to the Chrysanthemum Throne, marking the beginning of the Reiwa era in Japan following the abdication of his father, Emperor Akihito.

U.S. President Barack Obama announced that Osama bin Laden, the leader of al-Qaeda, was killed by U.S. Navy SEALs in Abbottabad, Pakistan, ending a nearly decade-long manhunt following the September 11 attacks.

The Icelandic banking crisis began to unfold as the Glitnir bank tried to refinance its debt, marking the beginning of Iceland's significant financial turmoil.

The Great American Boycott, also known as 'A Day Without Immigrants,' took place in the United States, where millions of immigrants and their supporters protested against proposed anti-immigration legislation.

The European Union expanded to include 10 new member states, marking the largest single expansion of the EU in terms of people and number of countries.

U.S. President George W. Bush declared the end of major combat operations in Iraq aboard the USS Abraham Lincoln, marking a significant moment in the Iraq War.

Ayrton Senna, a Brazilian Formula One driver, died in a crash during the San Marino Grand Prix, leading to significant safety changes in the sport.

Japan's Naomi Uemura became the first person to reach the North Pole alone.

Fidel Castro declared Cuba as a socialist nation and formally abolished elections, marking a definitive shift in the Caribbean country’s political alignment and intensifying its isolation from the United States.

The U-2 incident occurred when an American U-2 spy plane was shot down over the Soviet Union, escalating Cold War tensions.

The Portella della Ginestra massacre occurred in Sicily, Italy, when bandits opened fire on a May Day labor festival, killing 11 people.

Adolf Hitler's death was announced on German radio, with Grand Admiral Karl Dönitz succeeding him as President of Germany.

The Empire State Building was officially opened in New York City, becoming the tallest building in the world at the time.

Cypress Hills Massacre Treaty, aimed at settling claims from an 1874 massacre of Assiniboine people by American wolf hunters in Canada, came into effect.

The Scofield Mine disaster occurred when an explosion in a coal mine in Scofield, Utah, claimed the lives of 200 miners.

The first official celebration of International Workers' Day, also known as May Day, is held after being established by the Second International to commemorate the Haymarket affair.

The World's Columbian Exposition opened in Chicago, celebrating the 400th anniversary of Christopher Columbus's arrival in the New World.

The Haymarket affair began in Chicago as part of a nationwide movement for an eight-hour workday, leading to a violent confrontation.

The first official adhesive postage stamp, the Penny Black, became valid for use in the United Kingdom. It featured a portrait of Queen Victoria and revolutionized the postal system by simplifying the process of sending mail.

Publication of Species Plantarum by Carl Linnaeus, marking the formal start of plant taxonomy.

The first cricket match was played in America, in New York.

The Act of Union came into effect, uniting the Kingdom of England and the Kingdom of Scotland into a single sovereign state known as the Kingdom of Great Britain.

Stefan Batory is elected King of Poland, marking a significant moment in Polish history as he became a notable ruler who strengthened the Polish-Lithuanian Commonwealth.

Christopher Columbus receives his commission of exploration from Spain, marking the official beginning of the plans for his first voyage.

The Treaty of Edinburgh-Northampton is signed, ending the First War of Scottish Independence and recognizing Scotland's independence from England.

The coronation of King Philip V as the king of Navarre takes place. Philip was the first husband of Queen Joan II of Navarre and became king after her father, Louis X of France, passed away.

The supernova SN 1006, the brightest supernova in recorded history, was first observed. It was visible across a portion of the sky in the constellation of Lupus and was recorded by observers in China, Egypt, Iraq, Italy, Japan, and Switzerland.

The Battle of Thimeon takes place, where the Frankish army under Charles the Fat defeats the Viking forces.

King Sigismund of Burgundy is executed at Orléans after being defeated by the Franks.

Roman Emperors Diocletian and Maximian retire from office, marking the first voluntary abdication of Roman emperors in history.