Following the Zanzibar Revolution of 1964, the island of Zanzibar was unified with Tanganyika to form Tanzania. After this, Nyerere placed a growing emphasis on national self-reliance and socialism. Although his socialism differed from that promoted by Marxism–Leninism, Tanzania developed close links with Mao Zedong's Marxist-governed China. In 1967, Nyerere issued the Arusha Declaration which outlined his vision of ujamaa. Banks and other major industries and companies were nationalised; education and healthcare were significantly expanded. Renewed emphasis was placed on agricultural development through the formation of communal farms, although these reforms hampered food production and left areas dependent on food aid. His government provided training and aid to anti-colonialist groups fighting white-minority rule throughout southern Africa and oversaw Tanzania's 1978–1979 war with Uganda which resulted in the overthrow of Ugandan President Idi Amin. In 1985, Nyerere stood down and was succeeded by Ali Hassan Mwinyi, who reversed many of Nyerere's policies. He remained chair of Chama Cha Mapinduzi until 1990, supporting a transition to a multi-party system, and later served as mediator in attempts to end the Burundian Civil War.