Introduction: modeling patterns of human migration. -- Earliest human migrations, to 40,000 BP. -- Peopling Northern and American regions, 40,000 to 15,000 BP. -- Agriculture, 15,000 to 5000 BP. -- Commerce, 3000 BCE to 500 CE. -- Modes of movement, 500 to 1400 CE. -- Spanning the oceans, 1400 to 1700. -- Labor for industry and empire, 1700 to 1900. -- Bright lights of urbanization, 1900 to 2000.