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.
U.S. state
Other possible new states are Guam and the U.S. Virgin Islands, both of which are unincorporated organized territories of the United States. Also, either the Northern Mariana Islands or American Samoa, an unorganized, unincorporated territory, could seek statehood.