Exterminate All the Brutes 

William Bache gave an outline of Sven Lindqvist's Exterminate All The Brutes. The book is a good introduction to how European powers used Darwinian natural selection theories and scientific racism to justify slavery and their global imperial ambitions. The imperial powers were successful due to advances in firepower coupled with the ability of European powers to globally project their naval forces at sea and inland water-ways, such as the Nile, Mekong, and Amazon . Their ships and gunboats were used to control coastal and river-based trade over much of the world.