Wednesday, March 1, 1820

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.