Question

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. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States.
–Constitution of the United States

This excerpt from a constitutional amendment explains

residency in the United States.
citizenship of the United States.
immigration to the United States.
law enforcement in the United States.

Answer 1

citizenship of the United States.

It defines who is a U.S. citizen (born or naturalized and subject to U.S. jurisdiction) and limits states from abridging citizens' privileges or immunities.