On Jan. 25, 1971, Colonel Amin deposed President Obote. Obote went into exile in Tanzania. Amin expelled Asian residents and launched a reign of terror against Ugandan opponents, torturing and killing tens of thousands. In 1976, he had himself proclaimed President for Life. In 1977, Amnesty International estimated that 300,000 may have died under his rule, including church leaders and recalcitrant cabinet ministers.

After Amin held military exercises on the Tanzanian border in 1978, angering Tanzanias president, Julius Nyerere, a combined force of Tanzanian troops and Ugandan exiles loyal to former president Obote invaded Uganda and chased Amin into exile in Saudi Arabia in 1979. After a series of interim administrations, President Obote led his Peoples Congress Party to victory in 1980 elections that opponents charged were rigged. On July 27, 1985, army troops staged a coup and took over the government. Obote fled into exile. The military regime installed Gen. Tito Okello as chief of state.