The U.S. Pacific Territory of Guam is an unincorporated and organized territory of the United States located in the western Pacific Ocean. It is the largest and southernmost of the Mariana Islands and is the largest island in Micronesia. Guam has been a member of the United Nations since 1986 and is considered an important strategic location for the United States military. The economy of Guam is largely supported by tourism, with the U.S. military presence also providing significant economic benefits.