U.S. Treasury Secretary Janet Yellen met on Friday with business leaders and officials in Dakar, Senegal as part of a 10-day Africa trip to strengthen U.S. relations with the continent and encourage investments. Yellen spoke about a wide range of issues including the effect of the war in Ukraine on Africa, the U.S.-Africa strategic partnership on food security, China's massive investments in African nations and Africa's potential business ventures with the U.S.