Article I, section 8:
The Congress shall have Power... To establish an uniform Rule of Naturalization.
So, yes, congress makes the laws that define who is a citizen. You can't come here in violation of our immigration laws and demand to be made a citizen. (But plenty of people try.)
Article IV, section 4:
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion;
Mexico is the only nation on earth that makes territorial claims against the United States. It is the only nation that teaches its citizens that large parts of the U.S. properly belong to them. We have had an unarmed invasion from Mexico going on for decades, and the states have been utterly unprotected from this invasion.
I never claimed to be a libertarian. I agree with them on many issues but disagree with them on others. A country with open borders is no longer a country. The end of the United States as a nation would be fine by many anarcho-libertarians, but it's not fine by me.
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