The Americans made valuable contributions to the war, major ones, but the Germans would still have lost even if the American government had refused to join the war.
Even if the Germans manage to capture England, Scotland, Wales, and Ireland, you still had massive areas of Commonwealth ristance in Canada, Newfoundland (wasn't apart of Canada yet) Australia, New Zealand, India, and other parts of the British Empire and Hitler was over extended as it was. The Germans, Italians, and Japanese would have burned out and ran out of resources before they could have taken out the rest of the British Empire.
And invading Canada would have been too risky, it would likely have dragged the Americans in anyways.
And the Canadian government had no problem recruiting Americans into our military. German didn't stand a chance by the end of the day.
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