The February Revolution, also known as the February Uprising, was a series of protests and strikes that took place in Petrograd (now Saint Petersburg) in February 1917. It led to the abdication of Tsar Nicholas II and the establishment of a provisional government.

Vladimir Lenin was the leader of the Bolshevik Party, which played a key role in the Russian Revolution. He returned to Russia from exile in April 1917 and led the party to victory in the October Revolution.

The Russian Soviet Federative Socialist Republic (RSFSR) was the first Soviet republic established after the October Revolution. It was the largest and most powerful of the Soviet republics and eventually became the Soviet Union in 1922.

The Treaty of Brest-Litovsk was a peace treaty signed between the Soviet Union and Germany in March 1918. It ended the Soviet Union's participation in World War I and gave Germany control over large parts of Soviet territory.

The New Economic Policy (NEP) was an economic policy implemented by the Soviet Union from 1921 to 1928. It allowed for some private ownership and market mechanisms, while still maintaining state control over key industries.

Joseph Stalin succeeded Lenin as the leader of the Soviet Union in 1924. He ruled the country with an iron fist until his death in 1953.

The Great Purge was a series of political purges carried out by Stalin in the Soviet Union from 1936 to 1938. It resulted in the deaths of millions of people, including many party officials, military leaders, and intellectuals.

The Gulag Archipelago was the name given to the vast network of forced labor camps in the Soviet Union. Millions of people were sent to the Gulag, where they were subjected to harsh conditions and forced to work in dangerous and often deadly jobs.

The Soviet Union collapsed in 1991. The collapse was the result of a combination of factors, including economic problems, political instability, and the rise of nationalism in the republics that made up the Soviet Union.

The Russian Revolution had a profound impact on the world. It led to the rise of communism as a global ideology, the Cold War between the Soviet Union and the United States, and the decolonization of Africa and Asia.