US President Joe Biden has concluded his three-day visit to Angola. On Wednesday, the final day of his visit, Biden toured the Lobito Corridor, the U.S.-financed 1,300-kilometer rail line that stretches from copper-rich Zambia to the port of Lobito in the southwest nation of Angola. Veteran Angolan independent journalist Mario Paiva tells VOA's James Butty, President Biden also held a summit with the presidents of Angola, Democratic Republic of Congo, Zambia, and the vice president of Tanzania.