A natural born citizen is not made by law. The 14th Amendment is a law.
The 14th Amendment was ratified to finally insure complete citizenship status for the freed slaves. You have to remember that they were counted as ‘citizens’ for representation purposes in Congress by the states, but were kept from all the rights of US citizenship. The 14th has nothing to do with naturalization, it was merely a formal law which finally defined who were the US citizens and the crux of the Amendment lies in the phrase ‘subject to the jurisdiction’ not in the phrase ‘born in the US’.
The 14th is NOT a naturalization law, it does not make one a citizen, that is done by A1 S8 C4 of the Constitution or by being born to citizen parent(S) or, if being born out of wedlock, born to an American mother. The 14th defines who is natural born and who is naturalized as there was no such thing as dual citizenship adopted and today, there is still no law on the books legalizing it. Since the revolution, there were the only 2 ways to gain citizenship, by natural law or by act of Congress and that is where the waters are still kept muddy. By those claiming that the 14th is a law that infers citizenship when it was only meant to define citizenship.