Franklin D. Roosevelt became President of the United States after the Great Depression, not after the First World War. He was elected as the 32nd President in 1932 and served for four terms, which is equivalent to 12 years, from 1933 until his death in 1945.
Franklin D. Roosevelt became the President of the United States after the First World War. He was first elected in 1932 and served for four terms until his death in 1945. Therefore, he served as President for a total of 12 years and 39 days.
