What if Germany had've invaded America?

ARGO: This may seem presumtuous but America has always walked hand in hand with the UK when it come to war. Almost like a father and teenage son. Sure America revolted against England much like the teenager rebelling against parents but there is still a deep friendship and loyalty to the UK that the US has never forgotton. So my guess is that if German attempted a US invasion the UK would be there and vice versa. History has proved if you mess with one you mess with both and God help anyone who shoots at England because the UK has a lot of friends.
Germany in the 1940s invading the USA......Not feasable without serious local help.