Expanded History
History of Guam
From antiquity to the modern era — the historical eras, key events, and narrative that shaped Guam.
Overview
The original inhabitants of Guam are believed to have been of Indo-Malaya descent originating from Southeast Asia as early as 2,000 B.C., and having linguistic and cultural similarities to Malaysia, Indonesia and the Philippines. The Chamorro flourished as an advanced fishing, horticultural, and hunting society. They were expert seamen and skilled craftsmen familiar with intricate weaving and detailed pottery making who built unique houses and canoes suited to this region of the world. The Chamorro possessed a strong matriarchal society and it was through the power and prestige of the women, and the failure of the Spanish overlords to recognize this fact, that much of the Chamorro culture, including the language, music, dance, and traditions have survived to this day. Latte StoneLatte Stones
Latte Stones are the stone pillars of ancient Chamorro houses. Found nowhere else in the world, the Taotaomona, Ancient Chamorro SpiritsLatte Stone has become a symbol and the signature, of Guam and the Marianas Islands. Original Latte Stones were comprised of two pieces, a supporting column (halagi), made from coral limestone topped with a capstone (tasa), made from coral heads, which were usually carried several miles from the quarry site or reef to the location of the house. Customarily, bones of the ancient Chamorro’s, their possessions, such as jewelry or canoes, were buried below the stones. Latte Stones are respected and are untouched. A human interloper at Latte sites may encounter Taotaomoa, or ancestral Chamorro spirits.
Archaeological milestones of ancient Guam are tied to the Latte Stones as: Transitional Pre-Latte (AD 1 to AD Latte Stone Park in Agana Guam1000), the larger Latte Period (AD 1000 to AD 1521), and Early Historic Period (AD 1521 to 1700). The eight Latte Stones shown here can be seen in Hagatna’s Latte Stone Park where they were transferred from their original location in Me’pu in Guam ’s Southern interior. Today, many Latte sites can be found in Northern Guam and replicas and images of Latte Stones can also be seen all around the Marianas, such as the "Welcome to Guam" monument at the International Airport , carvings, jewelry, in print or the logo at the top of this paragraph. Read more about Latte Stones at the Official Government of Guam WEB site and Science Frontiers.Com.
The Spanish Era (1565 - 1898)
The first known contact between Guam and the West occurred when Ferdinand Magellan anchored his small 3-ship fleet in Umatac Bay on March 6, 1521. Hungry and weakened from their long voyage, the crew hastily Umatic Bay, Site of Magellan’s Landing in 1521prepared to go ashore and restore provisions. However, the excited native Chamorro’s, who did not share the Spaniards concept of ownership, canoed out first and began helping themselves to everything that was not nailed down. The weakened sailors had trouble fending off the tall and robust natives until a few shots from the Trinidad’s big guns frightened them off the ship and they retreated into the surrounding jungle. Magellan was eventually able to obtain rations and offered iron, a commodity highly prized by Neolithic peoples, in exchange for fresh fruits, vegetables and water. Details of Magellan’s visit, and the first known Western documentation of Guam and the Chamorro, come from the journal of Antonio Pigafetta, Magellan’s chronicler and one of only 18 original crew members to survive Ferdinand Magellan’s ill-fated circumnavigation of the globe.
Guam and the other Mariana Islands were formally claimed by the Spanish Crown in 1565 by Miguel Lopez de Plaza de Espana, Hagatna, GuamLegazpi. In 1668, Jesuit missionaries led by Padre Diego Luis de San Vitores, arrived on Guam to establish their brand of European civilization, Christianity and trade. The Spanish taught the Chamorro’s to cultivate maize (corn), raise introduced cattle and tan hides, as well as to adopt western-style clothing. Once Christianity was firmly established, the Catholic Church became the focal point for village activities and Guam became a regular port-of-call for the Spanish treasure galleons that crisscrossed the Pacific Ocean from Mexico to the Philippines.
Chief Quipuha was the maga’lahi, or high ranking male, in the area of Hagatna when the Spanish landed off its shores in 1668. Quipuha welcomed the missionaries and allowed himself to be baptized by San Vitores as Juan Quipuha. Quipuha granted the lands on which the first Catholic Church in Guam, the Dulce Nombre de Maria {Sweet Name of Mary} Cathedral Basilica,
Historical Eras
The major periods of {country}’s history at a glance.
Ancient Chamorro
2000 BCE – 1521
The indigenous Chamorro people, believed to have migrated from Southeast Asia, established a sophisticated society on Guam by at least 2000 BCE. Skilled navigators, potters, and weavers, they organized around a matriarchal clan structure. Their most distinctive cultural achievement, the coral limestone latte stones used as house foundations, remains unique to the Mariana Islands and defines the Latte Period spanning roughly AD 1000 to 1521.
Spanish Colonial Era
1521 – 1898
Ferdinand Magellan made first Western contact at Umatac Bay in 1521, and Spain formally claimed Guam in 1565 under Miguel López de Legazpi. Jesuit missionaries arrived in 1668, triggering prolonged Chamorro-Spanish wars that drastically reduced the indigenous population. Despite brutal suppression, Chamorro women preserved much of their language and cultural traditions throughout nearly three and a half centuries of Spanish rule.
American Territory
1898 – 1941
Spain ceded Guam to the United States following the Spanish-American War, and the island was placed under U.S. Naval administration. Guamanians were classified as U.S. nationals but denied full citizenship, and the Naval government exercised strict control over political and economic life. The Organic Act of 1950, though not yet enacted, was preceded by decades of Chamorro petitions for greater rights and self-governance.
Japanese Occupation
1941 – 1944
Japan invaded and seized Guam on December 8, 1941, just hours after the attack on Pearl Harbor, subjecting its population to forced labor, internment, and systematic brutality. The occupation suppressed Chamorro identity by banning the Chamorro language and imposing Japanese culture and administration. U.S. forces retook the island in the Battle of Guam from July to August 1944, at great cost to both military personnel and the civilian population.
Postwar U.S. Territory
1944 – 1986
The Organic Act of 1950 granted Guamanians U.S. citizenship and established a civilian government, though the island remained under significant federal oversight. Guam served as a critical American military logistics hub during the Korean and Vietnam Wars, and the 1962 Naval Clearing Act opened the island to civilian immigration, spurring rapid demographic and economic transformation. Political discussions around self-determination intensified, culminating in a rejected 1979 constitutional referendum.
Modern Guam
1986 – present
Guam continues as an unincorporated U.S. territory with an elected governor and legislature, while debates over political status, decolonization, and a potential referendum on self-determination remain active. A major U.S. military buildup beginning in the 2000s expanded Guam's strategic role in the Pacific as a counterweight to rising regional tensions. The Chamorro people pursue cultural revitalization alongside ongoing negotiations with Washington over land rights, sovereignty, and full representation.
Timeline Preview
The first 7 key events. View the full chronology on the timeline page.
1521
Ferdinand Magellan arrived, named them Islas de los Ladrones.
Ferdinand Magellan arrived, named them Islas de los Ladrones.
1565
Spain claimed Guam, Marianas together with Philippines.
Spain claimed Guam, Marianas together with Philippines.
1898
Following the Spanish-American War, Spain ceded Guam to the U.S.
Following the Spanish-American War, Spain ceded Guam to the U.S., sold the other Mariana Islands to Germany.
1941 – 1944
Japanese occupation.
Japanese occupation.
1954 – 1975
Vietnam War; Guam logistical base.
Vietnam War; Guam logistical base.
1962
Naval Clearing Act (U.S.); ports of Guam opened for civilian traffic.
Naval Clearing Act (U.S.); ports of Guam opened for civilian traffic.
1979
Referendum rejected Guam constitution.
Referendum rejected Guam constitution.

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