Oh yes, the evil Americans...never mind the fact that the American expansion was simply a continuance of European imperialist ideals of colonization and expansion. England, France, Spain, Holland, and others had colonies in areas of the world that already had native peoples.

Of course, human nations/tribes/what-have-you have been killing each other off and taking their land all over the world for thousands of years, so why nitpick about one specific instance or group?