Sorry, yeah I used the term president, when I meant Chancellor, Hitler was in effective power from that point. He gained ultimate power when Hindenburg died and basically dissolved the dual system giving Hitler and the Nazis absolute rule with no checks. Prior to his death Hindenburg was basically just approving whatever the Nazis ask for anyway as he had pretty much no choice.
We could go on, but it has very little to do with democratically elected "State Daddy's" closing borders.