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

(1 point)
China and the United States
• supported opposing sides in the Vietnam War.
The USSR sent troops to
• preserve communist rule in Afghanistan.
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 successfully tested its first atomic bomb.