<human>:  Why did the USA boycott the 1956 Summer Olympics?
<bot>: The USA boycotted the games because they were held in the Soviet Union. This was a time when the Cold War was at its peak and the United States and the Soviet Union were engaged in a tense standoff. The Soviet Union had recently tested an atomic bomb, and the USA feared that the Soviets would use the games as a propaganda tool to demonstrate their technological superiority.