Explanation

Truman Doctrine was announced by Harry S. Truman, United States President.

The main purpose during the Cold War was to curb soviet diplomatic expansion.

President Harry S. Truman declared it to Congress on March 12, 1947, and it grew further on July 4, 1948, when he promised to curb the communist uprisings in Greece and in Turkey.

NATO in 1949 funding to the Truman Doctrine.

Between 1945 to 1953, Harry S. Truman became the 33rd President of the United States, succeeding Franklin D. Roosevelt 's death after serving as vice president.