The idea is that white Anglo-saxon men can build a country for their posterity free from the king of England.
It never was that the rest of the world could invade and take it over.
It is also the idea that birthright citizenship never was, and anyone who "earned" such a citizenship should have it revoked. And anyone who was "granted amnesty" should have that revoked too, and their great grandkids. It's high time we revisited everyone's citizenship, and revoked it from those who cannot affirm the rights to self-defence and the bearing of arms, etc...
It is also the idea the every square inch of American soil that my ancestors fought and died for should be governed by American people. And at some point, I'm going to say that includes even foreign countries that we've conquered. No more foreign wars, since there's no one to fight a real war with anymore. Just military actions of expulsion to clear the land for American families to settle. It's high time that the rest of the world got the idea that we will not be trifled with.
"America is just an idea" can go be "America" somewhere else.