Yeah. The french are very grateful for us pulling their butts out of the fire in TWO world wars, aren't they?
Personally, I think the fact that the rest of the magical world was not mentioned while a common enemy to all (Voldemort) staged a coup d'etat in Britain was a huge plot hole.
I disagree. Several times in the book Harry receives indications that while the Death Eaters are consolidating their power in Britain, Voldemort is busy running around the Continent trying to track down the Elder Wand. The European magical communities probably mis-intepreted Voldemort's actions, and thought he was getting ready to make a move against *them*. They were probably too busy seeing to their own defenses to worry about what was happening in Britain.