Why Didn't Germany Invade the Us?

Adolf Hitler dismissed the threat of America, stating that the country had no racial purity and thus no fighting strength, and further stated that "The American public is made up of Jews and Negroes".

Would Germany have been able to invade the US?

While Germany did land a handful of sabotage agents via U-Boat, there was simply no way of bringing an army across the sea. To mount a successful invasion would have required a forward staging base – such as how the U.S. Army was able to deploy not from America but from Great Britain.

Would Germany have won ww2 if the US?

Even with everything noted above, Germany and its European partners could have still won the war were it not for Germany's declaration of war on the United States on December 11, 1941. It was really the only time Nazi Germany had actually declared war on an enemy, and it needed not to have happened.