Except in Germany cars need to undergo an roadworthiness inspection every 24 months and the driving test is much more strict there. If you have a pulse, you can get a license in America.
American cars get safety(and emissions) inspections too and the second part is just not true. I think there's more to it than just casually dismissing americans as too "unregulated" and dumb to handle high speed roads. In the case of Germany's autobahn, after the reunification, road accidents initially increased in former East Germany so it's not like Germans are inherently superior drivers.