The French enacted the ''Code Noir'' ("Black Code"), prepared by Jean-Baptiste Colbert and ratified by Louis XIV, which established rules on slave treatment and permissible freedoms. Saint-Domingue has been described as one of the most brutally efficient slave colonies; one-third of newly imported Africans died within a few years. Many slaves died from diseases such as smallpox and typhoid fever. They had low birth rates, and there is evidence that some women aborted fetuses rather than give birth to children within the bonds of slavery. The colony's environment also suffered, as forests were cleared to make way for plantations and the land was overworked so as to extract maximum profit for French plantation owners.