1917 was a revolution that ended the monarchy in the Russian Empire. A provisional government replaced the Tsar, Nicholas II. This event began the RussianRevolution.
On November 6 and 7, 1917 (or October 24 and 25 on the Julian calendar, which is why the event is often referred to as the October Revolution), leftist revolutionaries led by Bolshevik Party leader Vladimir Lenin launched a nearly bloodless coup d'état against the Duma's provisional government.
In the civil war, the red and white army fought were in the end the red army wins. One-third of the soldiers who fought for the Union army were immigrants.