“Section 1. 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.”

What is the source and purpose of this excerpt?
It is from the 14th Amendment. It says citizens must live in one of the United States.
It is from the 14th Amendment. It says people are citizens by birth or naturalization.
It is from U.S. immigration laws. It says illegal immigrants must follow state laws.
It is from U.S. immigration laws. It says that immigrants may become citizens.