Joe Biden headed to Angola on Sunday for a trip that will deliver on a promise to visit Africa during his presidency and focus on a major U.S.-backed railway project that aims to divert critical minerals away from China.

President Biden will travel to Angola this week, becoming the first sitting president to do so and following through on a years-long pledge to visit sub-Saharan Africa.

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.