EASTERN CAPE PROVINCE, South Africa – At the scenic foot of a troubled continent of almost one billion people, among whom any good news is welcome, South Africa's 45 million inhabitants are building a uniquely bold venture in democracy. In many ways it is the boldest since the United States was founded. Ten years ago, this nation's liberated blacks voted freely for the first time. They stood eagerly under the sun in long serpentine lines that seemed to reach the horizon. Such photographs, taken on April 27, 1994, their day of independence, appear like trophies on the walls of government...