Which of the following statements about the Cold War is NOT accurate?

The competition between the superpowers extended into space.

During the 1950s it became clear that China was also a military and economic superpower, equal to the United States and the Soviet Union.

The United States and the Soviet Union built many nuclear weapons, but they were never used. Instead, weapons were collected and stored, or stockpiled, in case they might be needed at some point in the future.

In the 1950s, the United States and the Soviet Union began an arms race, a contest to build more and more powerful weapons.