This photo provided by Alabama Historical Commission shows artifacts from the Clotilda in Alabama Gulf Coast, the last known ship to bring enslaved people to the United States from Africa. (Daniel Fiore/Alabama Historical Commission via AP)
This photo provided by Alabama Historical Commission shows artifacts from the Clotilda, the last known ship to bring enslaved people to the United States from Africa at Alabama Gulf Coast. (Daniel Fiore/Alabama Historical Commission via AP)
This photo provided by Alabama Historical Commission shows artifacts from the Clotilda, the last known ship to bring enslaved people to the United States from Africa at Alabama Gulf Coast. (Daniel Fiore/Alabama Historical Commission via AP)
This photo provided by Alabama Historical Commission shows Marine archeologists diving into the Mobile River in Alabama Gulf Coast, to investigate the remains of the Clotilda, the last known ship to bring enslaved people to the United States from Africa. (Daniel Fiore/Alabama Historical Commission via AP)
This photo provided by Alabama Historical Commission shows artifacts from the Clotilda, the last known ship to bring enslaved people to the United States from Africa at Alabama Gulf Coast. (Daniel Fiore/Alabama Historical Commission via AP)
This photo provided by Alabama Historical Commission shows Marine archeologists diving into the Mobile River in Alabama Gulf Coast, to investigate the remains of the Clotilda, the last known ship to bring enslaved people to the United States from Africa. (Daniel Fiore/Alabama Historical Commission via AP)
This photo provided by Alabama Historical Commission shows artifacts from the Clotilda, the last known ship to bring enslaved people to the United States from Africa at Alabama Gulf Coast. (Daniel Fiore/Alabama Historical Commission via AP)
This photo provided by Alabama Historical Commission shows artifacts from the Clotilda, the last known ship to bring enslaved people to the United States from Africa at Alabama Gulf Coast. (Daniel Fiore/Alabama Historical Commission via AP)