Joe Biden pledged lasting U.S. engagement with Africa on Africans' own terms as he met his Angolan counterpart Joao Lourenco in Luanda on Tuesday as part of his only visit to sub-Saharan Africa as U.S.

Joe Biden on Tuesday used the first visit to Angola by a U.S. president to promote billions of dollars of commitments to the sub-Saharan African nation and speak at a slavery museum, where he'll acknowledge the trafficking that once linked the nations' economies.

The president will also announce initiatives related to global health and security cooperation, among other things, a senior administration official said.