Answer :
I am going to have to say D, A communist dictatorship was established in Russia after the Revolution, is the answer because the US was determined to spread democracy throughout the world and when Russia became communist that put a strain on relationships between the USA and Russia. The US in a round about way boycotted Communist countries.
Hopefully this helps.
Answer:
D
Explanation:
Because A. (The Soviet Union threatened the US with war) does not make sense and did not happen. And B. (The US threatened the Soviet Union with war) the US never threatened the Soviet union with war. Finally, C. (The US and the Soviet Union entered World War I on opposite sides) is definitely not true or correct. So D is your answer.