The American belief has long been that each generation will have a better life—economically, technologically, socially, personally—than the previous one. But this idea of linear historical progress did not exist in most other cultures. All ancient cultures—Chinese, Babylonian, Hindu, Greek, and Roman—had different views. Some saw history as cyclical, and others saw history as a slow decline from past golden ages.
The idea that history was moving in the direction of continual ...