Soviet Union
The Soviet Union officialy Union of Soviet Socialist Republics also known as USSR was the Russian state after end of Tsarist Period and the world's first single-party Marxist–Leninist state from 1922 until 1991. It was the first country to declare itself socialist and build towards a communist society. It was a union of 14 Soviet socialist republics and one Soviet Federative Socialist Republic (Russian SFSR).