|Japan attacked Pearl Harbor on December 7. U.S. entered World War II.
|Al-Qaeda terrorists attacked the U.S. with hijacked jets on September 11.
|The California Gold Rush began. The Mexican-American War ended.
|The Civil War ended. The 13th Amendment abolished slavery in the U.S.
|Neil Armstrong and Buzz Aldrin from Apollo 11 walked on the moon.
|Henry Ford began mass-production of the Model T automobile.
|The Declaration of Independence was adopted in Philadelphia on July 4.
|The stock market crashed on October 29. The Great Depression began.