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Nobody is claiming that He is not an American Citizen. He is most certainly an American citizen who was granted citizenship by the authority of a Congressional statute in which they exercise their power of naturalization.
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That is your assumption, a wrong one at that. A law may have been created to clarify what some like you did not understand but it doesn’t change the fact that the mother confers citizenship regardless of birth place. Read my previous posts about a mother visiting a country.
I have lived many years of my life overseas and it was well known that a mother confers citizenship and that anchor babies are not always accepted.
Prior to 1922? I don't think so.
Don't care what the modern PRACTICE is. The current law does not affect the meaning of a law written in 1787. Prior to 1922, American women Married to foreigners in foreign countries did NOT have American children. They had children of their husbands nationality.