Explanation:
The USSR was a federal union of 15 national republics, with Russia being the largest and most populous. It was a multi-ethnic nation-state that promised a socialist future and the protection of national identity. It was also the world’s second-largest economy and had the largest standing military, as well as the largest arsenal of nuclear weapons.
Also called The Soviet Union, the USSR was a founding member of the United Nations and one of the two superpowers during the Cold War. It was the first country to declare itself socialist and build toward a communist society. The USSR was governed by the Communist Party, and its political and economic systems were highly centralized.
Several factors led to the collapse of the USSR in 1991, and the 15 national republics gained full independence to become post-Soviet states. The dissolution also marked the end of the Cold War.

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