What if Germany had've invaded America?

ARGO: The only plausable area for an invasion would have had to be done through Mexico and primarily land based. Germany actually did consider it hence the Zimmermann letter which was intercepted and failed. Not to mention that I am sure Canada would not sit on their laurels and allow even the slightest chance of a US based invasion and Germany next door during that time period. Canada would have been side by side with the US as well as most likely allowing UK + Russia access through Canada to assist the US if the Axis did gain any ground even though highly and extremly unlikely.