The СССР, or the Union of Soviet Socialist Republics, was a federal socialist state that existed from 1922 to 1991. It was made up of multiple republics, with Russia being the largest and most influential. The government was based on the principles of Marxism-Leninism, and it aimed to create a classless society through state control of the economy and collective ownership of resources. During its existence, the СССР became a major global power, playing a significant role in events such as World War II and the Cold War. The state was known for its centralized planning, heavy industrialization, and extensive social programs. However, it faced economic challenges and political unrest, leading to its eventual dissolution in 1991.