Question

What was the United States' major concern about their former ally, the Soviet Union?

Answer 1

The Soviet Union murdered millions of their own citizens.

Answer 2

@Conqueror Debatable.

Answer 3

?

Answer 4

@Conqueror some might say that Stalin did not kill many of its own citizens, and his famines weren't intentionally caused. BTW the US had concerns because the USSR was developing Nuclear Weapons and the ideological differences between the two countries are huge.