“All the peoples of the world are one,” was Las Casas’s final pronouncement, meaning they all share one nature. That nature rested on man’s reason, the one characteristic that all human beings share regardless of where they live. Underneath the wide diversity of societies, from the most primitive to the most advanced, was a single common human nature addressing the same problems in the same way but with different results, because of differences in the physical and cultural environment. “Thus
