| September 1, 1715 | | Death of King Louis XIV of France ("The Sun King") |
| September 1, 1939 | | Hitler invaded Poland; thus began World War II in Europe |
| September 1, 1875 | | Birth of Edgar Rice Burroughs (1875-1950), author of Tarzan of the Apes |
| September 2, 1666 | | Great Fire of London |
| September 2, 1945 | | President Truman proclaims V-J Day upon the surrender of the Japanese |
| September 3, 1783 | | Treaty of Paris signed that ended the American Revolutionary War |
| September 4, 1781 | | City of Los Angeles founded by Spanish Governor Felipe de Neve |
| September 5-6, 1972 | | Eleven members of the Israeli Olympic Team were killed during an attack on the Olympic Village in Munich by members of the Black September faction of the Palestinian Liberation Army. |
| September 5, 1997 | | Death of Nobel Peace Prize winner and advocate for the poor, Mother Teresa of Calcutta |
| September 7, 1860 | | Birth of the great self-taught, late-life artist Anna Mary Robertson "Grandma Moses" 1860-1961 |
| September 8, 1900 | | The worst weather disaster in U.S. history: a hurricane with winds of 120 mph struck Galveston, Texas, killing over 8,000 persons. |
| September 9, 1776 | | The U.S.A. came into existence as the Continental Congress changed the name of the new American nation from the United Colonies to the United States. |
| September 9, 1976 | | Leader of Communist China, Chairman Mao Zedong died. |
| September 11, 2001 | | The worst terrorist attack in U.S. history. |
| September 12, 1990 | | Treaty was signed to reunite East and West Germany |
| September 14, 1901 | | Eight days after being shot, President William McKinley died from wounds suffered during an assassination attempt. Theodore Roosevelt then took over the presidency. |
| September 14, 1982 | | Former actress, American born Princess Grace of Monaco died following a car accident. |
| September 15, 1890 | | Birth of prolific English mystery writer Agatha Christie (1890-1976) |
| September 6, 1620 | | The Mayflower ship departed from Plymouth, England, bound for America with 102 passengers and a small crew. |
| September 16, 1810 | | Mexican Independence (from Spain) Day |
| September 19, 1893 | | New Zealand became the first country to grant women the right to vote. |
| September 23 | | Autumn begins in Northern Hemisphere (Spring in the Southern) |
| September 25, 1513 | | Balboa first sighted the Pacific Ocean after crossing the Isthmus of Panama. |
| September 25, 1897 | | Birth of William Faulkner (1897-1962), considered by many the greatest U.S. author |
| September 28, 1066 | | The Norman conquest of England began |
| September 28, 1542 | | Spanish discovery of California by Cabrillo |