Mostly this problem is contained in the fact that the US makes it so difficult for Canadians to get green cards (you heard it here), but if an American orchestra really wants a player, they have their ways.
“I think it's appropriate for the international community in situations like this to intervene in Kosovo. I am in favor of an intervention. On some level, you have to say that at least somebody is doing something.”
“That liberty is a great thing we may know from our own feelings, and we may likewise judge so from the conduct of the white-people, in the late war.”