Wikipedia:Selected anniversaries/September 11
- 1758 – Seven Years' War: France repelled an invasion attempt by the British in the Battle of Saint Cast.
- 1893 – On the opening day of the first Parliament of the World's Religions in Chicago, Swami Vivekananda (pictured) introduced Hinduism to the United States.
- 1914 – During the First World War, the Australian Naval and Military Expeditionary Force invaded German New Guinea, winning the Battle of Bita Paka.
- 1978 – Janet Parker, a British medical photographer, became the last recorded person to die from smallpox, leading to a debate on whether the virus should be preserved.
- 2001 – Al-Qaeda used four hijacked passenger airliners to carry out a series of suicide attacks against targets in New York City and the Washington, D.C., area.