Final answer:
The USSR stands for Union of Soviet Socialist Republics. It was a country that existed from 1922 to 1991 and competed with the United States during the Cold War.
Step-by-step explanation:
The acronym USSR stands for Union of Soviet Socialist Republics. It was a country that existed from 1922 to 1991, comprised of multiple Soviet republics, including Russia, Ukraine, Belarus, and others. The USSR was a superpower and competed with the United States during the Cold War, with both countries adhering to different ideologies and political systems.
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