| Japan attacked Pearl Harbor on December 7. U.S. entered World War II. |
1776 |
| Al-Qaeda terrorists attacked the U.S. with hijacked jets on September 11. |
1848 |
| The California Gold Rush began. The Mexican-American War ended. |
1865 |
| The Civil War ended. The 13th Amendment abolished slavery in the U.S. |
1908 |
| Neil Armstrong and Buzz Aldrin from Apollo 11 walked on the moon. |
1929 |
| Henry Ford began mass-production of the Model T automobile. |
1941 |
| The Declaration of Independence was adopted in Philadelphia on July 4. |
1969 |
| The stock market crashed on October 29. The Great Depression began. |
2001 |
