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.
Postage stamps and postal history of Guam
Since its annexation, Guam was the subject of one postage stamp produced by the United States Postal Service. On June 1, 2007 a 90-cent stamp, part of the airmail series "Scenic American Landscapes" depicting a sunset on a beach and the Hagåtña Bay was released.