The Nazi military was geared towards limited wars against small nearby countries (short-range planes, no significant surface navy, no colonial bases); they had no chance of conquering much of anything outside of Europe. Whenever any distance arose, they had serious problems (Britain, USSR, North Africa) - and never any real chance of winning once Britain wasn’t fighting alone after the fall of France. That was their window, and they failed. Until Japan entered the war in late 1941, the British empire itself faced little threat from the Axis.
No long range bombers to reach Detroit. Maybe we should have followed Pat Buchanan’s idea and not get involved.