Around 12,000 B.C., human beings in Asia moved north in search wooly mammoths and made their way across the Bering Straight to Alaska. Over the next several hundred years, they made their way to the Great Plains where they hunted huge mammals to the point of extinction. During the Archaic Period (9000 B.C. – 1000 B.C.), bands of hunters moved constantly from one area to another in constant search of a suitable food supply. By 1000 B.C. the first sedentary communities were developed near rich fishing areas along the coasts and large rivers. Sedentary people created complex mound communities along the Mississippi River and in the Ohio Valley. When improvements in corn reached the land north of the Mexican desert, there was a marked boom in sedentary city development. Corn cultivation influenced peoples’ religions and improved their health, helping to spawn a population growth after 800 A.D. These urban centers declined in the 13th and 14th centuries because of warfare, soil exhaustion and the disruption of inter-regional trade. In Europe, forces of social change were creating unrest; unrest which would prompt hundreds of people to explore the Atlantic Ocean and reshape the relationship between peoples of the world.
