What should America do about the conquest of Western Europe by Muslims?

Western European people do not want to have children because they are inconvenient. Their birth rates are heading toward half of what they need to be. Meanwhile Muslims are reproducing like rabbits. They are forming non English speaking unassimilated communities. There are predictions that say that Western Europe would be majority Muslim within 50 years. What should America do about it? Take the poll.

It is not America's problem or business. We should stay out of it.
We should rescue Western Europe again just like we did in the First and Second World Wars.
We should ban all unassimilated non English speaking Muslims from coming into the United States. And we should keep our powder dry.
Something else.
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What should America do about the conquest of Western Europe by Muslims?
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