Don't be so sure you know the status of these people who were born and raised in the US but go some place else to play. They could easily hold dual citizenship and you don't know it.
I'll have to blend a few laws, because I don't know all international laws. If you as a US citizen go to Germany and have a child, the child is a US citizen. If a German citizen comes to the US has a child, the child is a US citizen. That child is also most likely a German citizen just as in the example of the US citizens above. Now this child is born in the US and holds citizenship in the US and Germany.
If their parents immigrated 10 years prior to having the child then it is possible that you would not know the parents or even one parent is a citizen of Germany, and it probably wouldn't even come up in conversation. There are many legal permanent residents who never obtain US citizenship and live here for decades. I've even talked to a few people, during background investigations, who did not know the citizenship of their parents, because the topic just never came up.
But when a long train of abuses and usurpations, pursuing invariably the same object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new guards for their future security.
Translation for the intellectually challenged: If the government screws the people too much, it is the right and duty of the people to revolt and form a new government.