Jet engine.
Rockets capable of space travel.
The Nazis we captured after the war got us to the moon and back safely.
They developed our secret aircraft.
They helped us win the Cold War.
You need to re read history.
Start with “American hero” Warner Von Braun
If you drive a Volkswagen, are vegan, donate to animal rights groups, or have ever worn "designer clothing", then I'm going to laugh my ass off concerning your ignorance.