Who was the thirty-third President of the United States, serving from 1945-1953?

The thirty-third President of the United States, serving from 1945 to 1953, was Harry S. Truman. He took office following the death of Franklin D. Roosevelt in April 1945 and was pivotal during the post-World War II era, managing significant foreign policy challenges, including the beginnings of the Cold War and the implementation of the Marshall Plan to aid European recovery. His administration is also noted for the decision to use atomic bombs on Japan, which ultimately contributed to the end of World War II. Truman’s presidency introduced initiatives such as the Truman Doctrine, which aimed to contain communism, and the establishment of NATO, further solidifying his influence during a critical period in American history. The other options listed correspond to different periods and events, making Truman the unmistakable correct answer for this timeframe.