The Oromo, called Galla by the Amhara, constitute the largest and most ubiquitous of the East Cushitic-speaking peoples. Oromo live in many regions as a result of expansion from their homeland in the central southern highlands beginning in the sixteenth century. Although they share a common origiÍÍÍÍn and a dialectically varied language, Oromo groups changed in a variety of ways with respect to economic base, social and political organization, and religion as they adapted to different physical and sociopolitical environments and economic opportunities.

Even more uncertain than estimates of the Amhara population are estimates for the Oromo. The problem stems largely from the imperial government's attempts to downplay the country's ethnic diversity. Government estimates put the number of Oromo speakers at about 7 million in 1970--about 28 percent of the total population of Ethiopia. By contrast, the OLF claimed there were 18 million Oromo in 1978, well over half of a total population roughly estimated that year at 31 million. Anthropologist P.T.W. Baxter, taking into account the lack of a census (until 1984) and the political biases affecting estimates, asserted that the Oromo were almost certainly the largest ethnic group in Ethiopia, making up somewhere between a third and just over half its population. A widely accepted estimate in the late 1980s was 40 percent.

The Oromo provide an example of the difficulties of specifying the boundaries and nature of an ethnic group. Some Oromo groups, such as the Borana, remain pastoralists. But others, the great majority of the people, have become plow cultivators or are engaged in mixed farming. A few groups, particularly the pastoralists, retain significant features of the traditional mode of social and political organization marked by generation and age-set systems (see Glossary) and the absence of a centralized political structure others, such as those who established kingdoms along the Gibé River, developed hierarchial systems. Cutting across the range of economic and political patterns are variations in religious belief and practice. Again, the pastoralists usually adhere to the indigenous system. Other groups, particularly those in Shewa and Welega, have been influenced by Orthodox Christianity, and still others have been converted to Islam. Here and there, missionary Protestantism has had minor successes. Moreover, the Oromo sections and subsections have a long history of conflict. Sometimes this conflict has been the outcome of competition for land sometimes it has resulted from strife between those allied with Amhara and those resisting the expansion of the empire. Some Oromo adapted to Amhara dominance, the growth of towns, and other changes by learning Amharic and achieving a place in the empire's political and economic order. But they had not thereby become Amhara or lost their sense of being Oromo.

In the far south live several groups speaking languages of the Oromic branch of Lowland East Cushitic and in many cases sharing features of Oromo culture. Most have 200 been cn cultivators or mixed farmers, and some have developed peculiar features, such as the highlands-dwelling Konso, who live in walled communities of roughly 1,500 persons. All these groups are small and are often subdivided. With an estimated population of 60,000 in 1970, the Konso are the largest of these groups.

Three other Lowland East Cushitic groups--the Somali, Afar, and Saho--share a pastoral tradition (although some sections of each group have been cultivators for some time), commitments of varying intensity to Islam, and social structures composed of autonomous units defined as descent groups (see Glossary). In addition, all have a history of adverse relations with the empire's dominant Orthodox Christian groups and with Ethiopian governments in general.

The largest of the three groups are the Somali, estimated to number nearly 900,000 in 1970. Many Somali clans and lineages living predominantly in Ethiopia have close links with or are members of such groups in Somalia. The number of Somali in Ethiopia in the late 1980s--given the Ogaden War and the movement of refugees--was uncertain.

Somali society is divided into groups of varying genealogical depth based on putative or traceable common patrilineal descent. The largest of these groups is the clan-family (see Glossary), which is in turn divided into clans, which are further divided into lineages (see Glossary) and sublineages (see Glossary). The clan-family has no concrete political, economic, or social functions. The other groups do, however, and these functions often entail political and economic competition and sometimes conflict between parallel social units.

The government estimated that the Afar (called Denakil or Adal by their neighbors) numbered no more than 363,000 in 1970. Despite their relatively small numbers, they were of some importance because of their location between the highlands and the Red Sea, their antipathy to Ethiopian rule, and the quasi-autonomy of a part of the Afar under the sultan of Aussa before the 1974 revolution.

Except for several petty centralized states under sultans or shaykhs, the Afar are fragmented among tribes, subtribes, and still smaller divisions and are characterized by a distinction between noble and commoner groups, about which little is known. Most Afar are pastoralists but are restricted in their nomadism by the need to stay close to permanent wells in extremely arid country. A number of them in the former sultan of Aussa's territory have long been settled cultivators in the lower Awash River valley, although the imperial government initiated a program to settle others along the middle Awash.

Saho is a linguistic rather than an ethnic category. The groups speaking the language include elements from the Afar, the Tigray, Tigre speakers, and others, including some Arabs. Almost all are pastoralists. Most are Muslims, but several groups--those heavily influenced by the Tigray--are Ethiopian Orthodox Christians.

Little is known about the political and social systems of the ten or so groups making up the total estimated Saho- speaking population of 120,000, but each group seems to be divided into segments. None was ever marked by the noble- serf distinction characteristic of Tigre speakers to their north, and all were said to elect their chiefs.

The speakers of the Highland East Cushitic languages (sometimes called the Sidamo languages after a version of the name of their largest component) numbered more than 2 million in 1970. The two largest groups were the Sidama (857,000) and the Hadya-Libido speakers (700,000). Kembata- Timbaro-Alaba speakers and the Deresa made up the rest. Each of these two groups numbered about 250,000 in 1970. As the hyphenated names suggest, two or more autonomous groups speaking dialects of the same language have been grouped together. In fact, most Sidama, although calling themselves by a single name in some contexts, traditionally are divided into a number of localized and formerly politically autonomous patrilineal clans, each under a chief.

The Sidama and other Highland East Cushitic speakers are cultivators of ensete and of coffee as a cash crop. In areas below 1,500 meters in elevation, however, the Sidama keep cattle.

The Sidama and other groups have retained their traditional religious systems, although some have been responsive to Protestant missionaries. Others, such as the Alaba, the Hadya, and the Timbaro, have accepted Islam. Only the Kembata are converts to Orthodox Christianity.

There are six groups of Central Cushitic (Agew) speakers, five of which live in the central highlands surrounded by Amhara. The Bilen in the extreme northern highlands form an enclave between the Tigray and the Tigre speakers. Agew- speaking groups total between 100,000 and 125,000 persons. They are the remnants of a population thought to have been the inhabitants of much of the central and northern highlands when Semitic-speaking migrants arrived millennia ago to begin the process that led to the formation of such groups as the Tigray and the Amhara. It is likely that Agew speakers provided much of the basic stock from which the Amhara and Tigray were drawn.

The largest of the Agew-speaking groups are the Awi (whose language is Awngi), estimated to number 50,000 in 1970. The linguistically related but geographically separate Kunfel numbered no more than 2,000. The Awi and the Qimant, numbering about 17,000, retain their traditional religious system but the Kunfel and the Xamtanga, totaling about 5,000, are apparently Orthodox Christians. The Bilen have been much influenced by Islam, and many have begun to speak the Tigre of their Islamic neighbors as a second tongue.

A special case is the Beta Israel (their own name others call them Falasha or Kayla), who numbered about 20,000 in 1989, most of whom emigrated to Israel in late 1984 and in May 1991. Perhaps preceding the arrival of Christianity in the fourth century A.D., a group of Agew speakers adopted a form of Judaism, although their organization and many of their religious practices resemble those of their Orthodox Christian neighbors. The precise origins and nature of the Judaic influence are matters of dispute. Most Beta Israel speak Amharic as a first language. Agew occurs in their liturgy, but the words are not understood.

Except for the Beta Israel, all Agew-speaking groups are plow agriculturists (the Kunfel augment their livelihood by hunting). The Beta Israel had been cultivators until deprived of their right to hold land after a major conflict with the Amhara and their refusal to convert to Christianity in the fifteenth century. They then became craftsmen, although many later returned to the land as tenants.

The sole group speaking a Northern Cushitic tongue is the Beja, a Muslim pastoral group that numbered about 20,000 in 1970. (Many more live in neighboring Sudan.) Their language is influenced by Arabic, and the Beja have come to claim Arab descent since their conversion to Islam. Like many of the other nomadic pastoralists in the area, they traditionally were segmented into tribes and smaller units, based on actual or putative descent from a common male ancestor and characterized by considerable autonomy, although federated under a paramount chief.

Data as of 1991