World War II interrupted the Great Depression in the United
States. The death of FDR ended it. The election of Republicans in Congress in 1946 and 1948 were the final nails in the coffin. That crap about FDR and Keynesian economics ending the depression is a Democrat fairy tale.
At least when I went to school I was taught that no one really knows what ended the Depression - but it is likely the New Deal had no effect. The truth would be the New Deal made things worse.