When the southern African country of Rhodesia was reborn as Zimbabwe in 1980, democracy advocates celebrated the defeat of a white supremacist regime and the end of colonial rule. Zimbabwean crowds cheered their new prime minister, freedom fighter Robert Mugabe, with little idea of the misery he would bring them. Under his leadership for the next 30 years, Zimbabwe slid from self-sufficiency into poverty and astronomical inflation. The government once praised for its magnanimity and ethnic...