East Africa

• 1. Introduction

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  East Africa sits at the eastern edge of the African continent, and it holds a claim no other place on earth can make: it is where the human story almost certainly began. Evidence found at the Kenyan site of Olorgesailie, dating to about 320,000 years ago, shows that people there were already building long-distance trade networks, using pigments, and possibly crafting projectile points. These are the behaviors we associate with modern minds. And yet the region stretching from the Red Sea coast down to the southern highlands is also a place of staggering variety: eighteen sovereign states and four territories, a coastline shaped by centuries of Indian Ocean trade, and landscapes that range from near-rainless Somali desert to the snow-capped summit of Mount Kilimanjaro.

  What makes East Africa so difficult to pin down is that every time you think you have it defined, it expands. Ask a British speaker and they will likely tell you East Africa means Kenya, Tanzania, and Uganda. Ask the United Nations Statistics Division and you get a much larger canvas. The questions worth asking are these: How did a region this vast develop a shared identity at all? What forces, ancient and modern, have pulled it together and torn it apart? And why, after centuries of outside domination, does it now hold some of the fastest-growing economies on the continent?

• 2. Cradle of Humanity

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  Genetic and fossil evidence points to the Horn of Africa as the place where archaic Homo sapiens became anatomically modern humans, around 200,000 years ago. Two fossil groups, Homo sapiens idaltu and Omo Kibish, are considered the immediate ancestors of all people alive today, and their existence supports what scientists call the Out-of-Africa theory. In September 2019, researchers working from 260 CT scans reconstructed a virtual skull shape of the last common ancestor of modern humans, placing the moment of emergence somewhere between 350,000 and 260,000 years ago, through a merging of populations in South and East Africa.

  The likely exit route from Africa ran through the Bab-el-Mandeb strait, where the Red Sea is now about 12 miles wide. Around 50,000 years ago, sea levels were 70 meters lower, narrowing that crossing considerably and perhaps making it possible with simple rafts. Earlier hominins left bones in places that have become famous in the study of human origins: the Awash Valley in Ethiopia, Koobi Fora in Kenya, and Olduvai Gorge in Tanzania. Agriculture came later and unevenly. In the Ethiopian Highlands, the donkey and crops such as teff allowed farming to begin around 7,000 BCE. The tsetse fly and lowland disease barriers stopped that knowledge from moving south for a very long time.

• 3. The Bantu Expansion

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  Between 2,500 and 3,000 years ago, Bantu-speaking peoples began moving eastward from their homeland around southern Cameroon. Their migration was not a single wave but a millennia-long series of physical moves, language diffusions, and inter-marriages with communities they met along the way. Over the following fifteen centuries, Bantu communities gradually intensified farming and grazing across suitable areas of East Africa, pushing or absorbing most of the hunting-foraging peoples who had lived there before.

  When Bantu migrants reached central East Africa, they encountered Cushitic-speaking peoples already there. From those neighbors, linguistic evidence suggests, the Bantu borrowed the practice of milking cattle and the cattle vocabulary that still survives in a few modern Bantu pastoralist groups. On the coast, contact with Muslim Arab and Persian traders produced something entirely new. The Swahili language that emerged from this mixing has its original speech community centered on the coastal parts of Tanzania, particularly Zanzibar, and Kenya. Its grammar and structure are purely Bantu and African. Its vocabulary absorbed heavy Arabic influence, much the same way English remained a Germanic language even after centuries of Latin and French words entered it. The earliest Bantu inhabitants of the East African coast were likely the peoples referenced under the names Rhapta, Azania, and Menouthias in Greek and Chinese writings from as early as 50 CE, and the name Tanzania ultimately traces to those early encounters.

• 4. Ports, Spices, and Conquest

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  Vasco da Gama visited Mombasa in 1498, making the Portuguese the first Europeans to reach the coasts of what are now Kenya, Tanzania, and Mozambique by sea. His voyage proved it was possible to reach India directly by water, which immediately threatened the older overland and mixed-route spice trade that passed through the Persian Gulf and Red Sea. Portugal wanted to break what had been a Venetian trading monopoly, and East Africa became the hinge point of that ambition.

  In March 1505, Don Francisco de Almeida set sail from Lisbon with a large fleet on appointment as viceroy of newly conquered territory in India. He arrived at Kilwa, an island in what is now southern Tanzania, which yielded to him with almost no resistance. Mombasa fought harder but fell. Portuguese forces then attacked Ungwana, Barawa, Angoche, Pate, and other coastal towns until the western Indian Ocean was largely under their commercial control. The construction of Fort Jesus in Mombasa in 1593 was meant to lock in that position. It did not hold. British, Dutch, and Omani Arab pressure during the 17th century eroded Portuguese influence, and the Omani Arabs posed the most direct challenge. The Omani capital was relocated to Zanzibar in 1839 by Seyyid Said, consolidating Omani power on the coast. The Omani presence in Zanzibar and Pemba lasted until the Zanzibar Revolution in 1964.

• 5. Scramble and Its Aftermath

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  During the 19th and 20th centuries, nearly every territory in the region was absorbed into a European colonial empire. Britain took Uganda and Kenya, territories suited to cash crops like coffee and tea and to European-style settlement towns such as Nairobi and Entebbe. The German Empire claimed German East Africa, covering present-day Rwanda, Burundi, and the mainland part of Tanzania called Tanganyika. In 1922, Britain received a League of Nations mandate over Tanganyika and administered it until independence in 1961.

  France settled Madagascar, the fourth-largest island in the world, along with Reunion and the Comoros, after two military campaigns against the Kingdom of Madagascar. Britain had agreed to relinquish its interests in Madagascar in exchange for control of Zanzibar. Italy took the southern three-fourths of Somalia as a protectorate and colonized all of Eritrea starting in 1890. In 1895, Italy launched the First Italo-Ethiopian War from bases in Somalia and Eritrea. By 1896 it had become, in the source's own words, a total disaster for the Italians, and Ethiopia kept its independence. Ethiopia remained free until 1936, when the Second Italo-Abyssinian War brought it under Italian rule. The Italian occupation ended in 1941 during the East African Campaign of the Second World War.

• 6. Geography and Climate

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  The East African Rift, created by the separation of the Somali Plate and the Nubian Plate at 7 millimeters per year, has produced some of the most dramatic terrain on earth. Mount Kilimanjaro and Mount Kenya are the two tallest peaks in Africa. Lake Victoria is the world's second-largest freshwater lake. Lake Tanganyika is the world's second-deepest lake. These landmarks draw tourists to Kenya, Tanzania, Uganda, and Seychelles, where tourism forms a meaningful share of the economy.

  The climate defies what most people expect from a region straddling the equator. Rainfall below 600 millimeters per year covers much of the lowlands, and on the northern coast of Somalia, annual rainfall is less than 100 millimeters. Some years pass there without any rain at all. Two factors explain the dryness: the Somali Jet, a fast wind system that brings cool air from the southern hemisphere during the northern summer, and east-to-west river valleys in the Rift that channel moisture-laden Indian Ocean winds toward the Congo Basin rather than across East Africa. Further south and at higher altitude, rainfall climbs sharply. Moshi, near Kilimanjaro, receives around 1,100 millimeters, while the high mountain slopes can receive more than 2,500 millimeters annually. El Nino events and a positive Indian Ocean Dipole both influence how much rain falls in any given year.

• 7. People, Languages, and Faiths

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  Eastern Africa had an estimated population of 260 million in 2000. United Nations projections from 2017 suggest that number will reach 890 million by 2050 and 1.6 billion by 2100, a quintupling over the course of one century. The 2017 CIA estimate already placed the total at 537.9 million. Ethiopia alone held an estimated 102 million people as of 2016.

  The linguistic landscape is equally expansive. In the Horn of Africa and the Nile Valley, Afroasiatic languages dominate, including Cushitic tongues such as Oromo and Somali, Semitic languages such as Amharic and Tigrinya, and Omotic languages such as Wolaytta. Across the Great Lakes region, Bantu languages prevail, among them Kikuyu, Kinyarwanda, Luganda, and Kisukuma. Swahili holds a special position: with at least 80 million speakers as a first or second language, it functions as a trade language across the Great Lakes area and carries official status in Tanzania, Kenya, and Uganda. Nilotic languages, including Luo, Kalenjin, and Maasai, add further depth, primarily in the Great Lakes and Nile Valley areas.

  Christianity and Islam are the predominant religions across the region. Islam predominates in Comoros, Djibouti, and Somalia. Mauritius is an exception of a different kind, where almost half the population adheres to Hinduism. The Association of Religion Data Archives found in 2020 that the majority of Eastern Africa was Christian, and mostly Protestant.

• 8. Growth and Instability

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  East Africa's economies are currently growing faster than those of other parts of Africa, at 6% growth, with Rwanda, Uganda, Kenya, and Tanzania outpacing many neighboring countries. Nairobi and Addis Ababa serve as the main financial hubs for the region. Tourism is particularly developed in Tanzania and Kenya because of their safari parks, and agriculture still employs the majority of the workforce across most countries.

  That growth sits alongside a record of post-colonial violence that is difficult to absorb in any single sitting. The 1994 Rwandan genocide against the Tutsi, the Burundian Civil War, the Somali Civil War from 1991-2009, the Eritrean War of Independence from 1961-1991, and the ongoing Lord's Resistance Army insurgency spanning Uganda, South Sudan, and the Democratic Republic of the Congo are among the conflicts the region has endured. South Sudan peacefully seceded from Sudan in 2011, six and a half years after a peace agreement ended the Second Sudanese Civil War, but its independence was nearly derailed by disputes over the Abyei Area and the Nuba Hills. Tanzania has maintained stable government since independence, though political and religious tensions from the 1964 union between Tanganyika and Zanzibar remain. The Tigray war, which ran from 2020-2022, added to that history. What distinguishes the region is not the absence of crisis but the presence, in places like Rwanda, Kenya, and Tanzania, of institutions and economies that have found ways to grow through it.