Russian Revolution of 1917
The Russian Revolution is the collective term for a series of revolutions in Russia
Russian Empire
The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

 in 1917, which destroyed the Tsarist autocracy
Tsarist autocracy
The Tsarist autocracy |transcr.]] tsarskoye samoderzhaviye) refers to a form of autocracy specific to the Grand Duchy of Muscovy . In a tsarist autocracy, all power and wealth is controlled by the tsar...

 and led to the creation of the Soviet Union
Soviet Union
The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

. The Tsar was deposed and replaced by a provisional government
Provisional government
A provisional government is an emergency or interim government set up when a political void has been created by the collapse of a very large government. The early provisional governments were created to prepare for the return of royal rule...

 in the first revolution of February 1917 (March in the Gregorian calendar
Gregorian calendar
The Gregorian calendar, also known as the Western calendar, or Christian calendar, is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull known by its opening words Inter...

; the older Julian calendar
Julian calendar
The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year .The Julian calendar has a regular year of 365 days divided into 12 months...

 was in use in Russia at the time). In the second revolution, during October, the Provisional Government was removed and replaced with a Bolshevik
The Bolsheviks, originally also Bolshevists , derived from bol'shinstvo, "majority") were a faction of the Marxist Russian Social Democratic Labour Party which split apart from the Menshevik faction at the Second Party Congress in 1903....

 (Communist) government.

The February Revolution
February Revolution
The February Revolution of 1917 was the first of two revolutions in Russia in 1917. Centered around the then capital Petrograd in March . Its immediate result was the abdication of Tsar Nicholas II, the end of the Romanov dynasty, and the end of the Russian Empire...

 (March 1917) was a revolution focused around Petrograd (now St.