President Harry Truman opened the two-lane White House bowling alley.
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The Thornton Affair, a skirmish between American and Mexican soldiers in Texas, started a chain of events that led to the Mexican-American War.
Germany banned the denial of Nazi genocide against Jewish people during the Holocaust.
The Peloponnesian war came to an end when Admiral Lysander and his Spartan armies defeated their Athenian foes.
Kathmandu, Nepal, was devastated by a major earthquake.
Francis Crick & James Watson's discovery of the double-helix structure of DNA was formally announced.
