President Bush meets with the leaders of eight West African democracies in Senegal as he opens his five-nation tour of Africa. Bush says he's not prepared to say whether he will commit U.S. peacekeeping troops to Liberia. And in a visit to Goree Island, where Africans were shipped as slaves to the New World, Bush denounces America's history of slavery. Bush is now in South Africa. Hear NPR's Don Gonyea.