When Europeans first arrived on Guam, Chamorro society had three classes:matua (upper class), achaot (middle class), and mana'chang (lower class). The matua were located in the coastal villages, which meant they had the best access to fishing grounds whereas the mana'chang were located in the interior of the island. Matua and mana'chang rarely communicated with each other, and matua often used achaot as an intermediary. There were also "makåhna" (similar to shamans), skilled in healing and medicine. Belief in spirits of ancient Chamorros called Taotao mo'na still persists as a remnant of pre-European society. When Magellan arrived on Guam, he was greeted by hundreds of small outrigger canoes that appeared to be flying over the water, due to their considerable speed. These outrigger canoes were called Proas, and resulted in Magellan naming Guam Islas de las Velas Latinas (Islands of the Lateen Sails).

Guam—the only Spanish outpost in the Pacific Ocean east of the Philippines, became the regular port between Acapulco, Mexico and Manila from 1565 to 1815, and (since Philippine independence) the most western outpost of actual United States territory in the Pacific—is the biggest single segment of Micronesia, the largest islands between the islands of Kyushu (Japan), New Guinea, and the Philippines, and the Hawaiian Islands.

Archaeological evidence also suggests that Chamorro society was on the verge of another transition phase by 1521, as latte stones became bigger. Assuming the larger latte stones were used for chiefly houses, it can be argued that Chamorro society was becoming more stratified, either from population growth or the arrival of new people. The theory remains tenuous, however, due to lack of evidence, but if proven correct, will further support the idea that Pre-Contact Chamorros lived in a vibrant and dynamic environment.

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Spanish colonization and the Manila galleons

Portuguese navigator Ferdinand Magellan, sailing for the King of Spain, reached the island in 1521 during his fleet's circumnavigation of the globe. General Miguel López de Legazpi claimed Guam for Spain in 1565. Spanish colonization commenced in 1668 with the arrival of Padre San Vitores, who established the first Catholic mission. The islands were part of the Spanish East Indies governed from the Philippines, which were in turn part of the Viceroyalty of New Spain based in Mexico City.

Between 1668 and 1815, Guam was an important resting stop for the Spanish Manila galleons, a fleet that covered the Pacific trade route between Acapulco (Mexico) and Manila (Philippines). Guam, along with the rest of the Mariana and Caroline Islands, were treated as part of Spain's colony in the Philippines. While Guam's Chamorro culture is unique, the cultures of both Guam and the Northern Marianas were heavily influenced by Spanish culture and traditions during their 333 years of rule.^{8 -}

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The Spanish-American War and World War II

The island of Guam is 30 miles (48 km) long and 4 mi (6 km) to 12 mi (19 km) wide. The island experiences occasional earthquakes due to its location on the western edge of the Pacific Plate and near the Philippine Sea Plate. In recent years, earthquakes with epicenters near Guam have had magnitudes ranging from 5.0 to 8.7. Unlike the Anatahan volcano in the Northern Mariana Islands, Guam is not volcanically active.^{17 - However, due to its proximity to Anatahan, vog does occasionally affect Guam.18 -}

A coral table reef with deepwater channels surrounds most of Guam. Sandy beaches, rock cliff lines and mangroves characterize the coastline area. Sheer limestone coastal cliffs dominate the north, while the southern end of the island is mountainous, with lower hills in between. ^{19 -}

Guam is located in what has been nicknamed "Typhoon Alley" and it is common for the island to be threatened by tropical storms and possible typhoons during the wet season. The most intense typhoon to pass over Guam recently was Super Typhoon Pongsona, with sustained winds of 144 miles per hour, gusts to 173 miles per hour, which slammed Guam on December 8, 2002, leaving massive destruction.

Since Super Typhoon Pamela in 1976, wooden structures have been largely replaced by concrete structures.^{20 - 21 - During the 1980s wooden utility poles began to be replaced by typhoon-resistant concrete and steel poles. After the local Government enforced stricter construction codes, many home and business owners built their structures out of reinforced concrete with installed typhoon shutters.}

Due to cultural influence from outside forces, important aspects of the original Chamorro culture have been lost over the years. There has been a resurgence in protecting and preserving the culture the last few decades, and many scholars have traveled throughout the Pacific Islands conducting research to determine what Chamorro cultural practices such as dance, language, and canoe building may have been like.

Two aspects of Chamorro culture that withstood time are chenchule' and inafa'maolek. Chenchule' is the intricate system of reciprocity at the heart of Chamorro society. It is rooted in the core value of inafa'maolek. Historian Lawrence Cunningham in 1992 wrote, "In a Chamorro sense, the land and its produce belong to everyone. Inafa'maolek , or interdependence, is the key, or central value, in Chamorro culture . Inafa'maolek depends on a spirit of cooperation and sharing. This is the armature, or core, that everything in Chamorro culture revolves around. It is a powerful concern for mutuality rather than individualism and private property rights."

With the proposed increased military presence stemming from the upcoming preparation efforts and relocation efforts of U.S. Marines from Okinawa, Japan to Guam slated to begin in 2010 and last for the next several years thereafter, the amounts of total land that the military will control or tenant may grow to or surpass 40% of the entire landmass of Guam.

Villagers and the military community are inter-connected in many ways. Many villagers serve in the military or are retired. Many active duty personnel and Defense Department civilians also live in the villages outside of the military installation areas. The military and village communities have "adoption" programs where Guam's population and military personnel stationed in Guam perform community service projects.

Guam is a popular destination for Japanese tourists. Its tourist hub, Tumon, features over 20 large hotels, a Duty Free Shoppers Galleria, Pleasure Island district, indoor aquarium, Sandcastle Las Vegas–styled shows and other shopping and entertainment venues. It is a relatively short flight from Asia or Australia compared to Hawaii, with hotels and seven public golf courses accommodating over a million tourists per year. Although 75 percent of the tourists are Japanese, Guam receives a sizable number of tourists from South Korea, the U.S., the Philippines, and Taiwan.^{26 - Significant sources of revenue include duty-free designer shopping outlets, and the American-style malls:Micronesia Mall, Guam Premier Outlets, the Agana Shopping Center, and the world's largest Kmart.}

The economy had been stable since 2000 due to increased tourism, but took a recent downturn along with most of Asia. It is expected to stabilize well ahead of the projected transfer of U.S. Marine Corps' 3rd Marine Expeditionary Force, currently in Okinawa (approximately 8,000 Marines, along with their 10,000 dependents), to Guam between 2010–2015 but will cause an unprecedented 10% increase in the island's overall population. ^] In 2003, Guam had a 14% unemployment rate, and the government suffered a $314 million shortfall.^{27 -}

The Compacts of Free Association between the United States, the Federated States of Micronesia, the Republic of the Marshall Islands and the Republic of Palau accorded the former entities of the Trust Territory of the Pacific Islands a political status of "free association" with the United States. The Compacts give citizens of these island nations generally no restrictions to reside in the United States (also its territories), and many were attracted to Guam due to its proximity, environmental, and cultural familiarity. Over the years, it was claimed by some in Guam that the territory has had to bear the brunt of this agreement in the form of public assistance programs and public education for those from the regions involved, and the federal government should compensate the states and territories affected by this type of migration. ^] Over the years, Congress had appropriated "Compact Impact" aids to Guam, the Northern Mariana Islands and Hawaii, and eventually this appropriation was written into each renewed Compact. Some, however, continue to claim the compensation is not enough or that the distribution of actual compensation received is significantly disproportionate. ^]

The speed of mail traveling between Guam and the states varies depending on size and time of year. Light, first-class items generally take less than a week to or from the mainland, but larger first-class or Priority items can take a week or two. Fourth-class mail, such as magazines, are transported by sea after reaching Hawaii. Most residents use post office boxes or private mail boxes, although residential delivery is becoming increasingly available. Incoming mail not from the Americas should be addressed to "Guam" instead of "USA" to avoid being routed the long way through the U.S. mainland and possibly charged a higher rate (especially from Asia).

The Commercial Port of Guam is the island's lifeline because most products must be shipped into Guam for consumers. The port is also the regional transhipment hub for over 500,000 customers throughout the Micronesian region. The port is the shipping and receiving point for containers designated for the island's US Department of Defense installations, Andersen Air Force Base and Commander, Naval Forces Marianas and eventually the Third Marine Expeditionary Force.

Guam is served by the Antonio B. Won Pat International Airport, which is a regional hub for Continental Micronesia. The island is outside the United States customs zone so Guam is responsible for establishing and operating its own customs and quarantine agency and jurisdiction. Therefore, the U.S. Customs and Border Protection only carries immigration (but not customs) functions. Since Guam is under federal immigration jurisdiction, passengers arriving directly from the States skip immigration and directly proceed to Guam Customs and Quarantine.

However, due to the Guam and CNMI visa waiver program for certain countries, an eligibility pre-clearance check is carried on Guam for flights to the States. For travel to and from the Northern Mariana Islands (which have separate immigration regulations), a full inspection is performed though American citizens do not need a passport. Traveling between Guam and the States through a foreign point (for example, a Japanese airport), however, does requires a passport.

Most residents travel within Guam using personally owned vehicles. The local government currently outsources the only public bus system (Guam Mass Transit Authority), and some commercial companies operate buses between tourist-frequented locations.

Adults are the injurious stage of the insect. They are generally night-time fliers and when they alight on a host, they chew down into the folded, emerging fronds of coconut palms to feed on sap. V-shaped cuts in the fronds and holes through the midrib are visible when the leaves grow out and unfold. If the growing tip is injured, the palm may be killed or severe loss of leaf tissue may cause decreased nut set. Feeding wounds may also serve as an infection pathway for pathogens or other pests. The effects of adult boring may be more severe on younger palms where spears are narrower. Mortality of young palms has already been observed on Guam. Oviposition and larval development typically occurs in decaying coconut logs or stumps.

Control measures have been developed for CRB and the current strategy on Guam is to implement an integrated eradication program using pheromone-baited, attractive traps to capture adults, various methods to eliminate infested and susceptible host material, and pesticides to kill larvae and adults. Pesticides may also be applied to uninfested trees as a preventive treatment. USDA-APHIS has completed an Environmental Assessment for the coconut rhinoceros beetle eradication program on Guam (EA Number:GU-08-1, guaminsects.net/uogces/kbwiki/images/d/dc/CRB_EA.pdf). The eradication program is a cooperative effort between USDA (APHIS and Forest Service), GDA and the University of Guam (UOG). This document follows the Forest Service Pest Risk Assessment (Kliejunas et al. 2001) format and is intended to provide information regarding the current status of CRB on Guam, its potential to spread to uninfested locales, and the consequences of establishment. The high, moderate or low riskvalues are based on available biological information and the subjective judgment of the authors.

A joint initiative between Guam Customs &Quarantine (trains CRB detector dogs and CRB handlers), Guam Department of Agriculture (employs CRB detector dog handlers), University of Guam College of Agriculture (provides CRB Detector Dog program funding) and the U.S. Department of Agriculture Animal and Plant Health Inspection Station (federal agency providing strategic direction and regulatory guidance) to form the nation's first Bio-Security Task Force which features the nation's first CRB trained detector dogs. This program will provide enhanced capability and capacity for the invasive species interdiction and eradication program in order to mitigate these species on Guam and prevent it from spreading to other jurisdictions in the United States. This Task Force increases the island's capacity to handle the increased volume of invasive species associated with the unprecented military buildup on Guam.

Whitespotted boxfish (Ostracion meleagris

Royal angelfish (Pygoplites diacanthus

Phones in Guam