|Japan attacked Pearl Harbor on December 7 and the U.S. entered World War II.
|The California Gold Rush began and the Mexican-American War ended.
|The Civil War ended and the 13th Amendment abolished slavery in the U.S.
|The stock market crashed on October 29 and the Great Depression began.
|Al-Qaeda terrorists attacked the U.S. with hijacked jets on September 11.
|Neil Armstrong and Buzz Aldrin made the first moon landing.
|The Ford Model T mass-produced automobile was introduced.
|The "Declaration of Independence" was adopted by the Continental Congress.