You don’t need government investment to make that happen. The issue was the lack of money supply, which was solved partially by Roosevelt’s ban on owning gold,

You don’t need government investment to make that happen. The issue was the lack of money supply, which was solved partially by Roosevelt’s ban on owning gold, but partially by people fleeing Europe, which allowed the federal government to print more. This has nothing to do with Sanders’ policies though. Sanders’ policies are a continuation of everything wrong with the New Deal, namely things like the minimum wage and government-supported worker unions, which prevent hiring of low-skilled workers, usually from the lower class, and make hiring overall a risky process, leading to less hires, higher unemployment, and corporations outsourcing abroad.