Editing 1919 (section)

===September===
{{main|September 1919}}
* [[September 1]]–[[October 2]] &ndash; [[Russian Civil War]], Siberian Front: Admiral [[Alexander Kolchak]] launches his final offensive in the Tobolsk operation, defeating the [[Red Army]].
* [[September 3]] &ndash; [[Jan Smuts]] becomes the second [[Prime Minister of South Africa|prime minister]] of [[Union of South Africa|South Africa]].
* [[September 6]] &ndash; The U.S. Army expedition across North America, which started [[July 7]], ends in [[San Francisco]].
* [[September 10]]–[[September 15|15]] &ndash; The [[1919 Florida Keys hurricane|Florida Keys hurricane]] kills 600 in the [[Gulf of Mexico]], [[Florida]] and [[Texas]].
* [[September 10]] &ndash; The [[Treaty of Saint-Germain]] is signed, ending World War I with [[Austria-Hungary]] and declaring that the latter's empire is to be dissolved. The [[Republic of German-Austria]] becomes the [[First Austrian Republic]] but retains less than 40% of the prewar imperial territory.
* [[September 12]] &ndash; [[Gabriele D'Annunzio]], with his entourage, marches into [[Fiume]] and convinces Italian troops to join him.
* [[September 17]] &ndash; [[German South West Africa]] is placed under South African administration.<ref>{{cite book|author=Jan-Bart Gewald|title=Herero Heroes: A Socio-political History of the Herero of Namibia, 1890-1923|url=https://books.google.com/books?id=8AjKi2SUV2AC&pg=PA242|year=1999|publisher=Ohio State University Press|isbn=978-0-85255-749-5|pages=242}}</ref>
* [[September 18]]–[[November 14]] &ndash; [[Russian Civil War]], Western Front:  [[Battle of Petrograd]]: The White general [[Nikolai Yudenich]] approaches the city of [[Saint Petersburg]] with 18,500 soldiers, but is defeated by the defense organized by [[Leon Trotsky]].
* [[September 21]] &ndash; The [[Steel strike of 1919]] begins across the United States.
* [[September 27]] &ndash; [[Russian Civil War]]: The last British Army troops leave [[Arkhangelsk]] and leave the fighting to the Russians.
* [[September 30]] &ndash; [[Elaine massacre]]: An estimated 100 to 800 [[African Americans]] are killed<ref>[https://www.zinnedproject.org/news/tdih/elaine-massacre/ Sept. 30, 1919: Elaine Massacre &ndash; Zinn Education Project.] Retrieved December 25, 2021</ref> in [[Elaine, Arkansas]], by white mobs and vigilante militias assisted by federal troops<ref>{{Cite news|date=2020|title=The white press has a history of endangering black lives going back a century|newspaper=The Washington Post|url=https://www.washingtonpost.com/politics/2020/06/15/white-press-has-history-endangering-black-lives-going-back-century/}}</ref> in "the deadliest racial confrontation in [[Arkansas]] history and possibly the bloodiest [[racial conflict]] in the history of the United States".<ref name="Grdn2019">{{cite news |last1=Krug |first1=Teresa |title=A rural town confronts its buried history of mass killings of black Americans |url=https://www.theguardian.com/us-news/2019/aug/18/a-rural-town-confronts-its-buried-history-of-mass-killings-of-black-americans |access-date=19 August 2019 |work=The Guardian |date=18 August 2019}}</ref>