At the start of his 5-day trip to Africa, President Bush denounced slavery as "one of the greatest crimes of history." Equally repulsed by slavery, Washington Post reporter Keith Richburg nonetheless wonders, after spending three years in war-torn and disease-ravaged Africa, what his fate would have been had his ancestors not been sold as slaves roughly 400 years ago.In the week to come, Bush will encourage emergent democracies in Africa, and condemn militant rulers in the region. He appears close to sending 2,000 U.S. troops to Liberia to join an international peacekeeping force. In addition, Bush aims to alleviate the...