World War II Leader Tojo was the Prime Minister of Japan from 1941 to 1944. He was responsible for the attack on Pearl Harbor and the Japanese declaration of war against the United States and the United Kingdom. Franklin D. Roosevelt, the 32nd President of the United States, was in office from 1933 to 1945. He was a major leader in the Allied Powers during World War II and is credited with leading the country through the Great Depression. Dwight D. Eisenhower, the 34th President of the United States, was in office from 1953 to 1961. He was a five-star general in the United States Army during World War II and served as Supreme Commander of the Allied Forces in Europe.