1 March 1221

A Bosnian-Serb wedding procession was attacked in Sarajevo, resulting in what is widely considered the first casualty of the Bosnian War.

Pink Floyd's critically acclaimed album The Dark Side of the Moon was released.

In a trial lasting less than 90 minutes, German–British physicist Klaus Fuchs was convicted of violating the Official Secrets Act by supplying information from the Manhattan Project to the Soviet Union.

World War II: American and Australian troops won the Battle of Sio against Japanese forces as part of the New Guinea campaign.

Hoover Dam, straddling the Arizona–Nevada border on the Colorado River, was completed.

The Kronstadt rebellion began following mass protests in Petrograd demanding greater freedom in Russia with sailors and citizens taking up arms against the Bolsheviks.

The Australian cricket team, led by Warwick Armstrong, became the first team to complete a whitewash in the Ashes, an achievement that would not be repeated for 86 years.

Ethiopia defeated Italy at the Battle of Adwa, ending the First Italo-Ethiopian War.

French physicist Henri Becquerel discovered the principle of radioactive decay when he exposed photographic plates to uranium salts.

Yellowstone National Park (bison pictured), located mostly in the present-day U.S. state of Wyoming, was established by President Ulysses S. Grant.

Paraguayan War: Marshal Francisco Solano López died at the Battle of Cerro Corá.

The Russian chemist Dmitri Mendeleev (pictured) finished his design of the first periodic table.

Samuel Chase, the only Justice of the Supreme Court of the United States to be impeached, was acquitted by the Senate.

An attempt by François, Duke of Guise, to disperse a church service by Huguenots in Wassy, France, turned into a massacre, resulting in 50 dead, and starting the French Wars of Religion.

Thirty-five people are killed and 143 injured in a mass stabbing at Kunming Railway Station in China.

The Armenian police clash with peaceful opposition rally protesting against allegedly fraudulent presidential elections; as a result ten people are killed.

Tornadoes break out across the southern United States, killing at least 20 people, including eight at Enterprise High School.

English-language Wikipedia reaches its one millionth article, Jordanhill railway station.

Management of the United States Customs Service and the United States Secret Service moves to the United States Department of Homeland Security.

U.S. invasion of Afghanistan: Operation Anaconda begins in eastern Afghanistan.

The Envisat environmental satellite successfully launches aboard an Ariane 5 rocket to reach an orbit of 800 km (500 mi) above the Earth, which was the then-largest payload at 10.5 m long and with a diameter of 4.57 m.

Space Shuttle Columbia is launched on STS-109 to service the Hubble Space Telescope.

Titanic becomes the first film to gross over $1 billion worldwide.

Bosnia and Herzegovina declares its independence from Socialist Federal Republic of Yugoslavia.