152 1 year, the indigenous Chamorro people in Guam discovered the navigator Magellan, and Magellan's expedition left for Spain after staying on the island for several months. However, when passing through the Philippine Islands, the expedition clashed with the indigenous people on the island, and Magellan was injured and died. Guam has been occupied by Spain since 1565. The Spanish people returned to the Chamorro people in Guam. They saved their lives and gave them materials-300 years of Spanish occupation and rule. In the following year 100, Americans and Japanese fought for it. The United States seized Guam from Spain in the Spanish-American War of 1898.

In World War II, Guam was once the seat of the US Pacific Fleet Command. 194 1 12 was occupied by the Japanese army, and 1944 was occupied by the American army. After the war, the US Admiralty rebuilt the Guam military base. 1950, the United States declared Guam as its "unincorporated territory", and now it has built the largest naval and air base of the United States in the western Pacific, with various military facilities accounting for about 1/3 of the island area. There are mainly apra Nuclear Submarine Base, Algana Naval Air Station and Anderson Strategic Air Force Base.

1950, the United States passed a bill to declare the island an "unincorporated territory" of the United States, and gave the Guam self-government local power and placed it under the jurisdiction of the United States Department of the Interior. Guam base has always occupied a very important position in the US military base system in the western Pacific. During the Korean War and Vietnam War, Guam, as an important strategic base of sea and air, played an important role in assembling troops, transporting ammunition and supporting long-range bombing. After the end of the Cold War, due to major changes in the international strategic pattern, the US military did not invest in repairing Guam's base facilities for several years. Blair, former commander of the US Pacific Command, has repeatedly criticized Guam's base facilities for being too old. The oil storage facilities have been used for more than 50 years and must be rebuilt.