Tsar Nicholas II took control of the army after losses, thinking he could help the army win the war.
We will win this war! We will show that we are the superior country!
Fine!
On February 23, 1917, International Women's day, women took to the streets of Petrograd and protested, leading to Nicholas II abdicating the throne.
Abdicate the throne!
Vladimir Lenin gave speeches in Russia after coming from Germany, and he promoted peace but actually used violence to achieve his goals.
Peace, bread, and land!
In October 1917, the Bolsheviks led a revolution but only won a minority of seats in the new Constituent Assembly. Leon Trotsky was part of the revolution as directed Soviet forces.
Trotsky built a "Red Army" that was loyal to him and a system of secret police called Chekha that targeted his opponents.
After the death of Lenin, the leader of the USSR, Joseph Stalin took over as dictator of the Soviet Union.