In addition to English, which language is officially spoken on the island of Guam?

Guam is an unincorporated and organized territory of the United States in Micronesia in the western Pacific Ocean. It is the westernmost point (in terms of jurisdiction) and territory of the United States, along with Northern Mariana Islands. The capital city of Guam is Hagåtña and the most populous city is Dededo. The inhabitants of Guam are called Guamanians, and they are American citizens by birth.

The official languages of the island are English and Chamorro. Chamorro is an Austronesian language spoken by about 58,000 people (about 25,800 people on Guam and about 32,200 in the Northern Mariana Islands and the rest of the United States). It is the native and spoken language of the Chamorro people who are the indigenous people of Guam and the Northern Mariana Islands, US territories.

The indigenous Chamorros settled the island approximately 4,000 years ago. Portuguese explorer Ferdinand Magellan, while in the service of Spain, was the first European to visit the island on March 6, 1521. Guam was colonized by Spain in 1668 with settlers, including Diego Luis de San Vitores, a Catholic Jesuit missionary. Between the 16th century and the 18th century, Guam was an important stopover for the Spanish Manila Galleons. During the Spanish–American War, the United States captured Guam on June 21, 1898. Under the Treaty of Paris, Spain ceded Guam to the United States on December 10, 1898. Guam is among the seventeen non-self-governing territories listed by the United Nations.