Well, its interesting, the Americans probaly dont consider the UK to be part of Europe.
The Americans polcily of declaring Germany their favoured Euro ally is most likely based on economics, and on a post WW2 fixation with percieved German military prowness.
In reality recent events have shown that the Germans are starting to turn hostile towards Americans, i have spoken to American servicemen stationed in Germany who have encontered alot of hostility, policy now is for them to claim to Canadian when asked.