Most of the New Deal was more or less a continuation of policies already started under Hoover.
And FDR gets credit for getting us out of the great depression. It got worse under him and his massive government expansions and wage controls and all that - objectively by the statistics - and it only really ended with WW2 (basically the government employed everyone directly in the service or indirectly in war production while putting massive restraints on what people could purchase for personal use i.e. rationing).