Stop me if you've heard this one: A Puerto Rican walks into (the U.S. Supreme Court, a Republican National Convention, a Hertz rental office ...) and is made to feel as though they aren't a U.S. citizen.
You should have been yelling "Stop!" almost as soon as you started to read that sentence because there is at least one high-profile incident each year in which our fellow Americans — yes, fellow Americans — reveal their ignorance of the island's status as a commonwealth of the United States.
That status, which has only been in place since, oh, [checks notes] the Truman administration, gives those born in Puerto Rico the same birthright citizenship (yes, we're citizens) as anyone born in the 50 states under Section 302 of the Immigration and Nationality Act.