Let's take GB for example: Celts were minding their own business when these pesky Angles & Saxons showed up, demanding their stuff, including their daughters. They acquiesced - after all, the "new" English were much larger, stronger and aggressive - and a new era took hold. However, lo and behold, after getting nice and comfy, a new crew of French speaking Danes show up and take the newcomers stuff. Not only that, but they were much more rigid and organized, so they inventoried and confiscated everything down do a remaining duck.
And guess what? The storied England to this day is still owned, ruled and governed by the descendants of William 1,000 years later. Moral of the story: He who holds the territory determines who and who isn't a citizen, who and who doesn't have power, who gets to direct million of peasants to charge machine gun bullets, and who gets to drink fine wine and travel the globe.
This is the core essential of every country, England, France, Germany, and the US. If the current inhabitants can't keep it, they don't deserve it. We're on the same page with respect to opposing the enemy, it's just that I take a much more real world approach.
America is unique and a Dutchman grasps it better than you do.