My sister was born in Germany and has dual citizenship. It may surprise you to know that most countries do that but who wants to be like most countries?
Actually, Ted Cruz had dual citizenship of US and Canadian, all because he was born in that country. Our founders had a much better idea. Like all who know why the 14th was enacted, just barely, it was intended only for the time of those slaves who were brought here unwillingly. But I have also heard lately the left is raising that same argument for the illegals coming here to get the US stamp on their kids.