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3,800 BP – 1668: Ancient Guam


People first arrived on Guam and the rest of the Mariana islands probably from Southeast Asia, possibly in many waves over many years. These people evolved into the Chamorro people with their own distinct language and way of life.

1668 – 1898: Spanish Era


Starting with the arrival of Father San Vitores, Guam was colonized by Spain until the Spanish-American War.

1898 – 1941: U.S. Naval Era


The U.S. Navy ruled Guam from the end of the Spanish-American War up until the Japanese invasion of Guam on December 8, 1941. The Chamorros petitioned for U.S. citizenship for the first time in 1901.

1941 – 1944: World War II/Japanese Era


Japanese forces occupied Guam from Dec. 8, 1941 to July 21, 1944.

1944-1950: Post-War Era


A period of rebuilding after the destruction of World War II. Naval Governors were once again in charge of the island. This the period when the military took land and built several large bases. The people of Guam pushed hard for self rule and U.S. citizenship.

1950 – 1970: Guamanian Era


With the signing of the Organic Act on August 1, 1950 Chamorros became U.S. citizens, though they had limited self government. The governor, a civilian, was appointed by the U.S. president. The Organic Act set up the Government of Guam as well, with the Administration, the Legislature and the Courts. The term “Guamanian” was coined, which includes Chamorros, Filipinos and everyone else who makes Guam their home.

1970 – Present: Contemporary Guam


Guam’s first elected governor took office and Guam started having a tourism on a regular basis which gave the island a second industry besides military. Chamorros continue to struggle for self-determination.