It belongs to the Natives and the British and the French and bits of it belong to the Spanish as well or perhaps the Mexicans, who also perhaps belong to the Spanish now that one thinks of it. Of course it also belongs to the Americans, since there's no right or wrong and everything is both true and false and it's all just perspective and a sovereign nation's territorial integrity doesn't matter.
Or maybe this is a completely useless argument that I dismissed because the actual causes of the invasion are practical, and not moral at all. But who knows, after all there's no right or wrong.