Question

What was the big boom that started off the Cold War?

Answer 1

The big boom that started off the Cold War was the Soviet Union's successful testing of their first atomic bomb in 1949.

Step-by-step explanation:

The big boom that started off the Cold War was the Soviet Union's successful testing of their first atomic bomb in 1949. This event ended the United States' monopoly on nuclear power and significantly heightened tensions between the two superpowers. The arms race intensified as both the United States and the Soviet Union developed more advanced and destructive nuclear weapons, leading to the Cold War becoming dominated by the constant threat of a nuclear conflict.