In 1998, on the occasion of the 150th anniversary of the abolition of slavery, the Departmental Archives and Library, the Léon Dierx Museum and the Villèle Museum presented a major exhibition accompanied by a vast catalogue of unpublished heritage documents bearing witness to the slave trade on the island. Twenty years later, the Departmental Council has repeated this project, made better by scientific improvements allowing us to fully understand both the progress made and also the many challenges that remain if we truly wish to collectively shoulder this shared history.