I just wanted to add that many countries have similar ancestor laws allowing you to apply for citizenship if you have any roots there. It’s not always easy - but at least you may have an “in” that others would not. So if you think you have a grandfather who immigrated from somewhere or other, look it up and see if you might be able to get on a path to citizenship there. My wife did this earlier this year, and all it took was some paperwork and a visit to a consulate with her parents.