March 20
1848 – German revolutions of 1848–49: King Ludwig I of Bavaria abdicates.
1854 – The Republican Party of the United States is organized in Ripon, Wisconsin.
1915 – Albert Einstein publishes his general theory of relativity.
1999 – Legoland California, the first Legoland outside of Europe, opens in Carlsbad, California.
Births
1922 – Carl Reiner, American actor, director, producer, and screenwriter
1937 – Jerry Reed, American singer-songwriter, guitarist, and actor (d. 2008)
1957 – Spike Lee, American actor, director, producer, and screenwriter
1959 – Sting (wrestler), American wrestler
International Day of Happiness (United Nations)