Harry S. Truman was Vice President under Franklin D. Roosevelt and became the 33rd President after Roosevelt's death in 1945. His presidency was marked by key decisions during the aftermath of World War II. Truman's leadership style and decisions significantly shaped post-war America. ;
The correct answer is C. Harry S. Truman, who served as Vice President under Franklin D. Roosevelt and became the 33rd President upon Roosevelt's death in 1945. Truman's presidency was pivotal due to his decisions during the post-World War II era. His leadership influenced the direction of American foreign policy and domestic affairs significantly.
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