Speaking of “our nation’s original sin,” President Joe Biden on Tuesday toured a slavery museum in Angola and inspected shackles and a whip but also addressed Africa’s future.

Biden is using his third and final day in Angola to showcase the Lobito Corridor railway, where the US and key allies are investing heavily to refurbish 800 miles of train lines in Zambia, Congo, and Angola.

During remarks at the National Slavery Museum in Angola, President Biden said he believed the future runs through Africa. Biden also discussed the shared pasts and future partnerships of Angola and the United States as his time in the White House comes to a close.