The two are not mutually exclusive: FDR put the US on the path to active assistance & becoming one of the allied powers. It is also a path that might have been

The two are not mutually exclusive: FDR put the US on the path to active assistance & becoming one of the allied powers. It is also a path that might have been impossible if not for the social & jobs programs keeping people afloat in the years before that. A more complete collapse might have rendered the US too damaged to focus any effort outside of itself. As it was, many people opposed entering the war on precisely those grounds-- that the US should deal with its own internal problems rather than those a continent away. FDR plowed through those objections, and incidentally sparked the economic recovery fueled by massive industrial mobilization. Whether or not you agree with FDR's handling of the Great Depression, you cannot separate that from the course of events that shaped the outcomes of WW II (both good and bad)