This is a fill in the blank question. The complete question reads: What was one of the causes of increased hostility within the group of Allied powers? ___, who succeeded Franklin Roosevelt, lacked trust in the ___. He made his suspicious quite evident, which increased hostilities during the Cold War.
So the correct answer is, Harry Truman for the first blank and the Soviets for the second.
After the death of President Franklin D.Roosevelt, Harry Truman became the President of the United States. He somewhat had a different vision of the War and his allies. Truman did not trust Stalin and the Soviet Union. Truman was more cautious in his relationship with Joseph Stalin. Of course, this affected the Allies and created moments of tension between them.
