Answer:
Option: Worry about possible war with the USSR
Explanation:
Relationships between the U.S and the Soviet Union was a complex change of ideological, economic, and political, which began to changes and frequent hostile over the years. The political disputes between these two nations often blocked them from reaching a compromise of matters. The Cuban missile crisis drew them close to the war. The Cuban Missile Crisis was 13 days meeting between the Soviet Union, Cuba, and the United States.