Alberta & Saskatchewan Join Confederation
Sep 1 Wilfrid Laurier oversees Alberta and Saskatchewan joining the Confederation of Canada as its 8th and 9th Canadian provinces; both were separated from the Northwest Territories
- Sep 2 Chinese crown discontinues its Imperial Examinations (Golden Lists), civil service recruitment exams that dated back in some form to 581AD and influenced British civil service and beyond [1]
- Sep 2 New Zealand beats Australia 14-3 in cold, wet conditions in the first international Rugby Union match between the countries on New Zealand soil at Tahuna Park in Dunedin
- Sep 5 50 prominent men meet in Sydney's Australia Hotel to found the National Defense League fueled by fear of Japan after its victory over Russia
- Sep 5 Lillian Mortimer's play "No Mother to Guide Her" premieres in Detroit
Treaty of Portsmouth
Sep 5 Treaty of Portsmouth is signed concluding the Russo-Japanese War; US President Theodore Roosevelt receives the Nobel Peace Prize for his role as mediator
- Sep 6 Atlanta Life Insurance Company forms
- Sep 6 Chicago White Sox pitcher Frank Smith no-hits Detroit Tigers, 15-0
- Sep 6 General Trade journal publishes 1st Dutch photo (train accident)
- Sep 8 Pittsburgh Pirates strand NL record 18 men on base in 8-3 defeat to Cincinnati Reds at Exposition Park, Pittsburgh
- Sep 10 Japanese battleship Mikasa explodes at her moorings after the magazine catches fire, killing 251 seamen
- Sep 14 Albert Cuypstrat street market in Amsterdam inaugurated
- Sep 14 Dutch AR-politician AWF Idenburg named governor of Suriname
- Sep 14 RAC Tourist Trophy first run on Isle of Man
- Sep 18 Electric tramline opens in Rotterdam
- Sep 20 Cleveland makes AL record 7 errors in an inning
- Sep 21 Atlanta Life Insurance Co forms
- Sep 22 Race riot in Atlanta Georgia kill 10 black people and 2 white
- Sep 22 US Open Men's Golf, Myopia Hunt GC: Willie Anderson wins his 3rd consecutive Open title, and his record 4th overall, 2 strokes ahead of runner-up Alex Smith
- Sep 23 Mbunga-siege of Fort Mahenge German East-Africa broken
- Sep 27 Boston's Bill Dinneen no-hits Chicago White Sox, 2-0
E=mc²
Sep 27 The physics journal Annalen der Physik publishes Albert Einstein's paper "Does the Inertia of a Body Depend Upon Its Energy Content?", introducing the equation E=mc².
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