In the final 4th book, Thomas discusses the history of blacks instead of analyzing The English in the West Indies. Thomas discusses the history of the development slavery in America and in the West Indies. Thomas details how slave owners in the West Indies became god-parents to their slaves through the Catholic Church, and through this process developed personal relationships with slaves devoid of cruelty. The institutions of slavery developed very differently in America and the West Indies. Thomas lists the great accomplishments achieved by the "Negro Race", predicting that these accomplishments will continue growing. Thomas encourages "African descendants now dispersed in various countries of the Western Hemisphere ... at sufficient peace to begin occupying themselves about matters of racial importance".