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ich of the following events caused tensions to increase during the Cold War between 1948 and 1953?

The U.S. invaded the Dominican Republic to stop it from becoming a communist state.
The USSR successfully tested its first atomic bomb.
The USSR sent troops to preserve communist rule in Afghanistan.
China and the United States supported opposing sides in the Vietnam War

1 answer

The event from your list that caused tensions to increase during the Cold War between 1948 and 1953 is:

The USSR successfully tested its first atomic bomb.

This event, which occurred in 1949, marked the beginning of the nuclear arms race between the United States and the Soviet Union, significantly escalating tensions between the two superpowers. The other events you mentioned occurred outside the specified timeframe or were not directly related to the Cold War tensions that characterized the early post-World War II period through 1953.