The Russian Revolution started with poverty and hardships for peasants, while Russia's elite kept getting stronger. The Russians were already in a crisis, but World War 1 made their life harder. The Tsar was blamed for all of the hardships in Russia, and the for war. On February 23rd the national women's day was celebrated in St. Petersburg with women filling up the streets, but only the next day many signs showed "Down with the Tsar!"

The Government lost control of the Capital and Nicholas had to abdicate the throne after 200 years of Romanov Rule. The Provisional Government was made to write a new constitution for the Soviets, but,  the Petrograd Soviet, which was elected by civilians and soldiers that shared power. This was much more radical than the Provisional Government, but it was very into sticking in the war to honor the allies.
This decision however, was a fateful one.

The decision played into the hands of the Bolshevik Party, a smaller party headed by the leader Vladamir Lenin, he bitterly opposed the Imperialist War. His group's slogan was, "Bread! Peace! Land!"
A quick revolution with mutiny from soldiers and Bolshevik's took the streets, and lead to the arrest of Trotsky, a Bolshevik mastermind and leader. 

In August General Kornilov moved from the front to St. Petersburg and took the streets. Trotsky, recently released from prison organized with his supporters to defend the city against the military moving in. They were called "The Red Guards" and defended many key points in the city. Kornilov's soldiers started to mutiny and Bolsheviks gained a majority in the Petrograd Soviet. On the 25th of October the Bolshevik's made their move and took over the capitol and overthrew the provisional government. The Bolshevik's fought a civil war against foreign nations and WW1 also. The Bolshevik's have now taken over the whole Russian state.
The Bolshevik's were very anti-war people, because they did not want to be Imperialist, just expand their ¨Empire¨.