He took inspiration from what Hitler was doing in Germany.
IIRC, there are one or two WPA buildings on the Georgia Tech Campus. I’ve also seen some state parks works over in Alabama that were done by CCC.
I think the major difference here is that Hitler’s works were focused on building up facilities and capabilities that could easily transition to a war footing (e.g., ‘glider and aero clubs,’ youth programs, roads, etc.)