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Presidency of the Kenya African Union: 1946–1952

After British victory in World War II, Kenyatta received a request to return to Kenya in September 1946, sailing back that month. He decided not to bring Edna—who was pregnant with a second child —with him, aware that if they joined him in Kenya their lives would be made very difficult by the colony's racial laws. On his arrival in Mombasa, Kenyatta was greeted by his first wife, Grace Wahu and their children. He built a bungalow at Gatundu, near to where he was born, and began farming his 32-acre estate. Kenyatta met with the new Governor of Kenya, Philip Euen Mitchell, and in March 1947 accepted a post on an African Land Settlement Board, holding the post for two years. He also met with Mbiyu Koinange to discuss the future of the Koinange Independent Teachers' College in Githungui, Koinange appointing Kenyatta as its Vice-Principal. In May 1947, Koinange moved to England, leaving Kenyatta to take full control of the college. Under Kenyatta's leadership, additional funds were raised for the construction of school buildings and the number of boys in attendance rose from 250 to 900. It was also beset with problems, including a decline in standards and teachers' strikes over non-payment of wages. Gradually, the number of enrolled pupils fell. Kenyatta built a friendship with Koinange's father, a Senior Chief, who gave Kenyatta one of his daughters to take as his third wife. They had another child, but she died in childbirth. In 1951, he married his fourth wife, Ngina, who was one of the few female students at his college; she then gave birth to a daughter.

In August 1944, the Kenya African Union (KAU) had been founded; at that time it was the only active political outlet for indigenous Africans in the colony. At its June 1947 annual general meeting, KAU's President James Gichuru stepped down and Kenyatta was elected as his replacement. Kenyatta began to draw large crowds wherever he travelled in Kikuyuland, and Kikuyu press began describing him as the "Saviour", "Great Elder", and "Hero of Our Race". He was nevertheless aware that to achieve independence, KAU needed the support of other indigenous tribes and ethnic groups. This was made difficult by the fact that many Maasai and Luo —tribes traditionally hostile to the Kikuyu—regarded him as an advocate of Kikuyu dominance. He insisted on intertribal representation on the KAU executive and ensured that party business was conducted in Swahili, the lingua franca of indigenous Kenyans.

To attract support from Kenya's Indian community, he made contact with Jawaharlal Nehru, the first Prime Minister of the new Indian republic. Nehru's response was supportive, sending a message to Kenya's Indian minority reminding them that they were the guests of the indigenous African population. Relations with the white minority remained strained; for most white Kenyans, Kenyatta was their principal enemy, an agitator with links to the Soviet Union who had the impertinence to marry a white woman. They too increasingly called for further Kenyan autonomy from the British government, but wanted continued white-minority rule and closer links to the white-minority governments of South Africa, Northern Rhodesia, and Southern Rhodesia; they viewed Britain's newly elected Labour government with great suspicion. The white Electors' Union put forward a "Kenya Plan" which proposed greater white settlement in Kenya, bringing Tanganyika into the British Empire, and incorporating it within their new British East African Dominion. In April 1950, Kenyatta was present at a joint meeting of KAU and the East African Indian National Congress in which they both expressed opposition to the Kenya Plan.

By 1952, Kenyatta was widely recognized as a national leader, both by his supporters and by his opponents. As KAU leader, he was at pains to oppose all illegal activity, including workers' strikes. He called on his supporters to work hard, and to abandon laziness, theft, and crime. He also insisted that in an independent Kenya, all racial groups would be safeguarded. Kenyatta's gradualist and peaceful approach contrasted with the growth of the Mau Mau Uprising, as armed guerrilla groups began targeting the white minority and members of the Kikuyu community who did not support them. By 1959, the Mau Mau had killed around 1,880 people. For many young Mau Mau militants, Kenyatta was regarded as a hero, and they included his name in the oaths they gave to the organisation; such oathing was a Kikuyu custom by which individuals pledged allegiance to another. Kenyatta publicly distanced himself from the Mau Mau. In April 1952, he began a speaking tour in which he denounced the Mau Mau to assembled crowds, insisting that independence must be achieved through peaceful means. In August he attended a much-publicised mass meeting in Kiambu where—in front of 30,000 people—he said that "Mau Mau has spoiled the country. Let Mau Mau perish forever. All people should search for Mau Mau and kill it." Despite Kenyatta's vocal opposition to the Mau Mau, KAU had moved towards a position of greater militancy. At its 1951 AGM, more militant African nationalists had taken senior positions and the party officially announced its call for Kenyan independence within three years. In January 1952, KAU members formed a secret Central Committee devoted to direct action, formulated along a cell structure. Whatever Kenyatta's views on these developments, he had little ability to control them. He was increasingly frustrated, and—without the intellectual companionship he experienced in Britain—felt lonely.