51st state
Guam (formally the Territory of Guam) is an unincorporated and organized territory of the United States. Located in the western Pacific Ocean, Guam is one of five American territories with an established civilian government.
American Samoa
Unlike other U.S. territories (Guam, CNMI, Puerto Rico, U.S. Virgin Islands), American Samoa is not considered a U.S. State for the purposes of the U.S. Immigration and Nationality Act. This means that alien lawful permanent residents of the United States may be considered to have abandoned permanent residence if they have moved to live in American Samoa.