A certain amount of hereditary social stratification was found in Micronesia, but its degree varied considerably from some of the smaller Carolinian atolls, which had nominal hereditary chiefs with little special power or wealth, to the high island of Yap, which had several ranked endogamous castes. Other cultures that showed relatively marked social stratification were Palau, Pohnpei, Kosrae, the Marshalls, and the Gilberts. The Marianas may have also had distinct social classes before the Spanish conquest. In all of these areas there appear to have been some chiefs who were supported principally by tribute from their subjects, who were the object of considerable deference, who could punish offenses (especially against themselves and their own relatives) by fines, destruction of property, or death, and whose principal wives were generally members of other high-ranking families. Often they had subordinate chiefs and officials.

Throughout most of Micronesia the maximum independent autonomous political unit was the high island or the atoll, often subdivided into more than one polity. At the time of European contact, Satawan Atoll in the Mortlocks had four separate communities, each with its own leader, which sometimes fought one another. Palau had two confederations of villages or districts, each independent of the other, and the villages themselves had considerable autonomy. Pohnpei had five petty states, although traditions of a unified rule for the whole island are apparent from an earlier period. Chuuk was extremely fragmented politically, with several independent communities on each of the six larger high islands. The Marshalls and the Gilberts had larger polities and integrated groups of separate atolls under a high chief; these expansionist states achieved their fullest development after the introduction of firearms by Europeans.

The low islands between Chuuk and Yap have been described as belonging to the so-called Yapese empire. The purported empire consisted mainly of a chain of trading and ceremonial relationships with one of the states of Yap. Notably, the Yapese exerted no military force over the low islanders—but did claim the ability to punish them by sending cyclones, disease, and famine if they should fail to fulfill their obligations.

In most of the area from the Palaus in the west to the Marshalls in the east, the community was considered to be owned in some sense by a clan, the head of which was also the leader of the community. Other clans had land rights by their relation to former chiefs or to the men of the ranking clan, usually because their women had married men of the chiefly clan or because their men had rendered service to the chiefly clan in the past. The chiefly clans in some cases claimed their position by virtue of ancient military conquest and in others by virtue of being the first to occupy the land. The aboriginal pattern of political and community organization in the Marianas has been obscured by the early Spanish conquest, which exterminated most of the population and concentrated the remainder under close Spanish military and religious control.

Socialization and education

Micronesians were indulgent with infants. Children were inducted into adult life gradually, through observation and participation. There was little in the way of formal schooling or initiation ceremonies in most Micronesian societies.

Several forms of bodily ornamentation were practiced, mostly performed around puberty or in early adulthood. The most widespread of these was tattooing, practiced by both sexes. This and other forms of bodily adornment were generally done on individual initiative to demonstrate bravery and increase attractiveness.

Training in cultural specialties—including medicine, magic, mythology, house building, canoe building, and navigation—was often delayed until young adulthood or middle age. Usually an older relative taught an individual these skills, although sometimes outsiders would be instructed for a payment of food and goods. The most-formal training in esoteric knowledge appears to have been given by the specialists known in Chuuk as itang. These were men and women who had trained under an older expert adept in traditional history, oratory, war strategy and tactics, and magic. Those who had earned the title or degree of itang could thenceforth serve as an orator, ambassador, counselor, or executive officer for a chief.

Production and technology

The small groups of people who first settled the islands of Micronesia probably had few technical specialists among them. They most likely had a subsistence technology in which a few part-time specialists produced luxury items such as personal ornaments and the shell and stone valuables that were used, mostly in the western Carolines, for ceremonial payments.

Cutting tools were made from stone and shell. Europeans introduced iron, although some iron tools may have been obtained before that time from Asian sources in western Micronesia. Simple pottery has been found only in the western high islands of Micronesia: Palau, the Marianas, and Yap. Suitable clay apparently exists in Chuuk, Pohnpei, and Kosrae, but if pottery was ever introduced to those islands, it was not widely used.

Subsistence throughout the region was based primarily on fishing and horticulture, with fishing somewhat more important in the low islands and horticulture more important in the high islands. Domestic animals were found only in some areas and were generally limited to dogs and chickens, although archaeology indicates that small numbers of pigs were also kept on a few islands.

Coconuts and coconut palms were used everywhere, both as food and for other purposes, such as thatch, lumber, and cordage. Some form of taro, either true taro (Colocasia esculenta) or giant swamp taro (Cyrtosperma species), was probably cultivated everywhere except on some of the drier low islands in the east, where the groundwater tended to be too brackish. The breadfruit tree, which produces a large starchy fruit in abundance in the early summer, was also widely distributed. Bananas were an important food crop on the high islands.

Tropical yams (Dioscorea species), which produce large starchy tubers, are found today on a number of the high islands; they are of greatest importance as a cultivated crop on Pohnpei, where they have high prestige value and provide an important source of food in the winter. On some of the drier atolls in the Marshalls and the Gilberts, the pandanus tree is a major subsistence crop. The edible fruit of some cultivated varieties contains starch and sugar that can be made into flour and stored. Other varieties have large edible nuts. Some varieties of pandanus are cultivated for their leaves, used principally in making plaited mats and thatch for roofs.

Rice was introduced in the Marianas but later was largely replaced by corn (maize), introduced from Mexico by the Spanish conquerors. The sweet potato and cassava (manioc), also introduced by Europeans, now serve as alternate subsistence foods on some of the high islands.

Many kinds of fishing were practiced. Often there was a gendered division of labour in which men would fish in deep water and women would do so in the shallower waters of the fringing reefs. Low islanders also engaged in deep-sea trolling with sailing canoes and made expeditions to small uninhabited reefs and low islands to fish and collect turtle and seabird eggs.

All Micronesians relied heavily on water travel, although the high islanders used canoes principally in the sheltered coastal waters of their home islands. Micronesian canoes had a single hull with one outrigger. Canoes used in protected waters were often simple dugouts, but the oceangoing vessels, found especially in the central Carolinian atolls, the Marshalls, and the Gilberts, had sides built up of irregular planks that were caulked and sewn together with cord made from coconut-husk fibre.

Some of the atoll dwellers regularly went on trips requiring several nights on the open sea. Extra provisions were usually taken along as gifts and for emergency needs if the canoe was blown off course. It seems clear that, prehistorically, there was communication in chain fashion from the Ellice Islands and western Polynesia through the Gilberts, the Marshalls, and the Carolines to Palau and the southeast atolls and beyond them into the northern Moluccas in Indonesia. Probably there was also deliberate communication across the larger gap between the central Carolinian atolls and the Marianas, which have a long-established population of cultural Carolinian immigrants who have retained their original language.