On this day for the United States
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Events
- 1865 - Abraham Lincoln makes his last public speech.
- 1899 - Spain cedes Puerto Rico to the United States.
- 1921 - First sports broadcast on the radio.
- 1921 - Iowa becomes the first U.S. state to impose a cigarette tax.
- 1945 - World War II: United States forces liberate Buchenwald concentration camp.
- 1951 - Korean War: President Harry S. Truman relieves General Douglas MacArthur of overall command in Korea.
- 1965 - The Palm Sunday tornado outbreak of 1965: Fifty-one tornadoes hit in six Midwestern states, killing 256 people.
- 1968 - Lyndon B. Johnson signs the Civil Rights Act of 1968, prohibiting discrimination in the sale, rental, and financing of housing.
- 1970 - Apollo 13 is launched.
- 1981 - President Ronald Reagan returns to the White House from the hospital, 12 days after he was wounded in an assassination attempt.
- 2000 - AT&T Park in San Francisco, Minute Maid Park in Houston, and Comerica Park in Detroit open.
- 2001 - The detained crew of a United States EP-3E aircraft that landed in Hainan, People's Republic of China after a collision with a J-8 fighter is released.