Who was the United States’ main rival during the Cold War?

What does this answer mean?

The United States' main rival during the Cold War was the Soviet Union. USCIS accepts "Soviet Union," "USSR," or "Russia."

The Cold War was a long rivalry between the United States and the Soviet Union that began soon after World War II and lasted until 1991. It was called "cold" because the two powers never fought each other directly in a full war. Instead, they competed through alliances, an arms race, and conflicts in other countries.

The Soviet Union was a communist state made up of Russia and other republics, and the United States worked to limit the spread of communism. Both sides built large nuclear arsenals, and the most dangerous moment came during the Cuban missile crisis in 1962.

The Cold War ended as the Soviet Union came apart. The Berlin Wall fell in 1989, and on December 25, 1991, the Soviet Union dissolved.

The next question asks about the main concerns of the United States during the Cold War. At the interview, say "the Soviet Union."