They are, but they are treated differently. Through a bunch of racist decisions the supreme court allows them to be treated differently. They felt that the people of the territories weren’t civilized enough to participate in our democracy. They’re called the Insular Cases and very racist.

Congress eventually passed laws granting citizenship to people in the territories, except American Samoa.

The 14th applying to the territories has been ignored repeatedly by the courts.

It would end up probably like American Samoa, which its people are U.S. Nationals, not citizens.

They can do it in the territories. The ones that grant citizenship by birth were giving that through Congress passing laws for it. American Somoa does not grant citizenship by birth, instead its people are U.S. Nationals, but not citizens.