Guam is an island located in the Western Pacific. It is an overseas territory of the United States. It is an unconstitutional territory controlled by the United States. The indigenous people of the island are the Chamorro people who settled here about 3,500 years ago.Guam is still listed as a non-self-governing territory by the United Nations.Located at the southernmost tip of the Mariana Islands, it is the gateway to Micronesia.