On June 28, 1914, WWI began with the assassination of Archduke Franz Ferdinand by a Serbian-Nationalist, Gavrilo Princip. He was shot near a bridge along with his wife, Sophie.
Treat of Brest-Litovsk
In 1917 the February Revolution began with the citizens protesting and rioting over the scarcity of food. This led to the Abdication of the Tsar, their ruler, and the establishment of a Provisional Government.
In October 1917 there was a coup d'état, an overthrowing of the government. Leftist revolutionaries led by Bolshevik Party leader Vladimir Lenin overtook the provisional government and established the Soviet Union.
The Royal Family is Executed
On March 3, 1918, in the city of Brest-Litovsk, Russia signed a treaty with the central powers. In the treaty, Russia ended its participation in the War, lost a lot of land, and large financial payment.
The Russian Civil War was between 1918 - 1921. It occurred when many groups(white) had formed that opposed Lenin's Bolshevik(red). Lenin won the war leaving the Soviet Union very powerful for many decades.
In July 1918, the Russian Royal family was murdered by the Bolsheviks, bringing an end to the three-century-old Romanov dynasty.