In Angola on likely his last overseas trip in office, the president will tour a slavery museum and spotlight a rail corridor that is part of his administration’s strategy in the region.

When President Biden visits the country this week, he is expected to highlight a largely overlooked bond between Angola and the United States that was born out of the trans-Atlantic slave trade.

The mass slaying of West African soldiers by colonial forces at the end of World War II in Senegal remains shrouded in secrecy. But Senegal’s new government won’t abide the mystery.