Actually that’s why there is a Code of Laws under the broad principals laid out in the Constitution, the law of the land further defines constitutional principles.
The term “law of the land” was used in 1787 to write the Supremacy Clause of the United States Constitution. The Supremacy Clause states: “This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the authority of the United States, shall be the supreme Law of the land....”
The Framers made provision for any of their original thinking to be changed via constitutional amendment. For example, the Founding Fathers were dead set against direct popular election of Senators. But since 1913 we’ve had direct popular election of Senators (17th Amendment). Whatever the Framers meant by natural born citizen was further defined constitutionally by the 14th Amendment’s definition of two AND ONLY TWO forms of American citizenship; born and naturalized.
Elk v Wilkins, 112 U. S. 94 (1884):
“The distinction between citizenship by birth and citizenship by naturalization is clearly marked in the provisions of the constitution, by which ‘no person, except a natural-born citizen, or a citizen of the United States at the time of the adoption of this constitution, shall be eligible to the office of president;’ and ‘the congress shall have power to establish an uniform rule of naturalization.’Const. art. 2, § 1; art. 1, § 8.
This section [of the 14th Amendment] contemplates two sources of citizenship, and two sources only: birth and naturalization. The persons declared to be citizens are “all persons born or naturalized in the United States, and subject to the jurisdiction thereof.”
if you’re going to say the 14th amendment defines who is a citizen, then consider the wording:
“All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside.”
it does not mention people born of one or more parents outside the US.
strictly by the 14th Amendment, TCruz wouldn’t be a US citizen as he was not born in the country, but in canada.