The citizenship of everyone born in the United States was disputed by Great Britain, and that dispute was not ended by the Revolutionary War, nor did treaties of peace quell the disputed claim completely. U.S. citizens were being seized and conscripted at sea under British claims of perpetual allegiance as natural born subjects to the crown, leading up to the War of 1812. This citizenship dispute was, in fact, a cause of that war.
This is why I’ve concluded that those who attribute the origin of the term natural born citizen to English common law are wrong. The Founders’ own citizenship was disputed under that same construct. “Perpetual allegiance” was roundly mocked and even despised by citizens of the United States in the years leading up to the Consitutional Convention.
That’s a lot like the current US “perpetual allegiance” in which the Feds won’t allow US citizens to renounce their citizenship if they feel it’s done for tax avoidance purposes.