From on legal site: "American Samoans are considered U.S. nationals, which means they are entitled to some rights and protections under U.S. law, but they are not considered U.S. citizens. American Samoans cannot vote in U.S. elections, run for political office, or serve on a jury."
The status of American Samoans has been a political issue for years and the courts have even held that they are US nationals, not US citizens. Congress has never fixed this.
I read dad was us citizen at birth but wiki could be wrong. But the mom was born in Indiana.