How did Truman's attitude toward the Soviet Union change between 1946 and 1951

President Harry S. Truman confronted unprecedented challenges in international affairs during his nearly eight years in office.

Explanation:

The Truman Doctrine was informally extended to become the basis of American Cold War policy throughout Europe and around the world. It shifted American foreign policy toward the Soviet Union from détente (a relaxation of tension) to a containment of Soviet expansion as advocated by diplomat George Kennan.