It is 400 years since African slaves were brought to America.
The Speaker of the US House of Representatives, Nancy Pelosi, led a delegation to Ghana this week to commemorate the anniversary.
Pelosi described the trade as "a grave evil" which the modern US is still reckoning with.
The visit came as a new campaign gets underway in Ghana aimed at attracting African-Americans to the continent.
Al Jazeera's Katia Lopez Hoda-Yan reports.
