Take a country like South Sudan for example. Of course they have their citizenship laws over there. However, how did the first citizens of the nation acquire it? It can’t be based on whether you were born there or not because there was no defined country for you to be born in. And if it’s based on descent, same problem. Your parents couldn’t have been born in a country that doesn’t exist. Did South Sudan just not have de jure citizens at first?
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Generally, everyone who lives within the new country’s borders when it forms becomes a citizen. If the country wants something different, they would need to include it in their founding documents.
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