The United States of America does not have a prime minister. The president is the head of government. During World War I. Woodrow Wilson was the president of the United States of America throughout World War I.
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Woodrow Wilson was President of the United States during America's involvement in World War I.
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Roosevelt for most of it
Harry Truman.
President Dwight Eisenhower was the commanding general of the victorious forces in Europe during world war 2.
Franklin D. Roosevelt was president of America during World War 2. He died shortly before the end of World War 2. Harry S. Truman became the second U.S President during the second world war duration of which was shortened by the dropping of nuclear bombs on Hiroshima and Nagasaki....
President Woodrow Wilson was the president during World War 1. President Franklin Delano Roosevelt was the president during World War 2 until he died near the end of the war. President Harry S. Truman was president through the end of the war and during the Korean War.
Harry S Truman succeded FDR.
Franklin Delano Roosevelt was President of the United States of America at the beginning of World War II. He died on April 12, 1945, at which point Vice President Harry S Truman became President. Truman served throughout the rest of the war.
Abraham Lincoln was President of the United States of America during the Civil War. Jefferson Davis wa President of the Confederate States of America during the Civil War.