What an absolutely juvenile view of history and the settlement of the Americas.
Now let's say that a man crosses the border illegally from Mexico. His name is Gort. His family has been in Mexico since the time of European Spain's rule in the Sonoran plains and mountains extending into la California, eastern Atzlan, including Texas, and the rest of the Gulf Coast States including la Florida and Cuba. His ancestors are Irishmen, Spaniards and native Americans. What do we do with him. He is a tall, fine featured, light skinned individual with blue eyes. What do we make of him. Would we accept him for who his ancestors were? We all live in the Americas in this hemisphere. The notion that the Pilgrims came to an empty land that was free for the taking is nationalistic hubris. We are all now Americans from the Arctic circle to Tierra del Fuego. The Americas are a collection of provinces and sub provinces occupied by people with both similar and diverse ancestry.
The future of this country, the US, will be one determined by populations who are breeding. They are having babies at this moment. There is an inevitability in the future of the US that is not particularly North European and not particularly Caucasian. Get used to it or take issue with it intelligently! Petulance and arrogance are not going to fix it. I have given you a hint above regarding the way out of the situation. Get about it.
And do please grow up!