The Civil Rights Act included a definition for national citizenship, to guarantee that former slaves would forever be free of the infamous Dred Scott decision which declared black people were not American citizens. That provision read, “All persons born in the United States, and not subject to any foreign power, excluding Indians not taxed, are hereby declared to be citizens of the United States.”
That was the original meaning of the jurisdiction language in the Fourteenth Amendment. A person who is “subject to the jurisdiction” of the United States is a person who is “not subject to any foreign power”—that is, a person who was entirely native to the United States, not the citizen or subject of any foreign government. The same members of Congress who voted for the Thirteenth Amendment in 1865 then voted to define citizenship for freed slaves in a federal law in 1866, then voted again months later in 1866—using only slightly different language—to put that definition of citizenship in the Constitution, language that was ultimately ratified by the states in 1868 as the Fourteenth Amendment.
In 1884, the Supreme Court in Elk v. Wilkins noted that the language of the Civil Rights Act was condensed and rephrased in the Fourteenth Amendment and that courts can therefore look to the Civil Rights Act to understand better the meaning of the Fourteenth Amendment. The Court reasoned that if a person is a foreign citizen, then their children are likewise not constitutionally under the jurisdiction of the United States, and therefore not entitled to citizenship. In fact, the Court specifically then added that this rule is why the children of foreign ambassadors are not American citizens.
That is why Congress can specify that the children of foreign diplomats and foreign soldiers are not Americans by birth. They’re not “subject to the jurisdiction” of the United States. Congress’s INA does not grant them citizenship; federal law never has.
So why is a child born on American soil to foreign parents an American citizen by birth? Because the Fourteenth Amendment’s Citizenship Clause is a floor, not a ceiling. Under Article I, Section 8, Clause 4 of the Constitution, Congress has absolute power to make laws for immigration and for granting citizenship to foreigners. Congress’s current INA is far more generous than the Constitution requires. Congress could expand it to grant citizenship to every human being on earth, or narrow it to its constitutional minimum.
JRichard Posner of the 7th Circuit Court of Appeals is America’s most-cited federal judge — and, by the way, no friend to conservatives. In 2003, he wrote a concurrence simply in order to demand that Congress pass a law to stop “awarding citizenship to everyone born in the United States.”
The purpose of the 14th Amendment, he said, was “to grant citizenship to the recently freed slaves,” adding that “Congress would not be flouting the Constitution” if it passed a law “to put an end to the nonsense.”
Facts are facts and the facts are the 14th amendment doesn't grant automatic birthright citizenship. Never has. This is one of the biggest scams the government has ever pulled on the American people.
The above quotes are from articles I've linked to on this thread and another one.