There is no such thing as a legitimate border, except as dictated by bygone conquest and/or relatively recent convention. ...But we are supposed to accept current borders as sacred, despite ugly histories and utterly unearned disparities in resources? Just about every country claims to be non-imperialist, and some even toss a bone to the remnants of the designated previous owners, but only dim suckers take this as truly legitimate. When was the last time you were allowed to call what country your home should be part of? ...Or even to move into whatever "country" you wanted to live in? It comes down to power. It is laughable that some Texans actually believe that they have the right to secede, and that some Greenland residents think the choice is theirs. The world is always on the edge of war, and the victors will dictate who owns what. In anticipation of that, smart leaders will establish the strongest possible alliances today, and that would be statehood. If the USA can seize and hold Greenland and Canada and ??? without being blown off the map by the fearful or jealous competitors, who can really say that is illegitimate. Arguably, the best thing that could happen is for the whole world to be forcibly united in a single nation of substantially autonomous states. Only then will humanity finally have the prospect of unity.