Finally, war helped to a great discovery—that men as well as animals can be domesticated. Instead of killing a defeated enemy, he might be enslaved; in return for his life he might be made to work. This discovery has been compared in importance to that of the taming of animals. . . . By early historic times slavery was a foundation of ancient industry and a potent instrument in the accumulation of capital. —V. Gordon Childe, Man Makes Himself
