Look guys, the fact is that most, if not all, of the inhabited spots on this planet have been invaded and forcefully taken from a group of people that lived there. The who, where, and why have changed over time, but the fact is, it happened. To say that any one group of people were more entitled to it than another would almost come down to determining exactly who first established a human population in that area. Since those people are no longer around as a single culture, and so intertwined with other cultures, which are now cultures in and of themselves, saying it belonged to some one because they were here first doesn't accomplish anything at this point.
What matters now is that we do have borders that most people recognize. The days of imperialistic conquests are over, or are nearly extinct. The cultures of these countries have a right to preserve their culture. Even the US has a culture. Yes, it's comprised of numerous cultures, baking for a few hundred years, but the US does now have a culture. If people want to move here from other nations, they need to adapt and assimilate into that culture, as they should anywhere they go outside of the country of their native culture.
