FILE PHOTO OF PRESIDENT CLINTON GREETING FAMILY DURING HIS TRIP TO AFRICA, 1998-04-01 (photo)

File photo showing then U.S. President Bill Clinton greeting the Sow family in the village of Dal Diam, outside Dakar, on April 1, 1998, on the last stop of his six-nation African tour. Current U.S. President George W. Bush starts his own African adventure this week, visiting five countries in a whistle stop tour from Tuesday to Saturday. Since Theodore Roosevelt's first visit in 1909 through Clinton's visit in 1998, few U.S. presidents have been sighted in sub-Saharan Africa, a vast continent whose continued poverty and brutal ethnic warfare challenge Washington's evolving vision of a global "Pax Americana." REUTERS/FILE/Win MCNamee/FEATURE/BUSH-AFRICA-PRESIDENTS GAC/WS/GN