US History: Early America Most authorities believe that the Western hemisphere was populated at the end of the last ice age when a lowered ocean level exposed a land bridge that Asian peoples traversed to North America. Later, the arriving European settlers discovered the existence of extensive civilizations. In the southern reaches of North America (present-day Mexico and Central America) the Mayan civilization built sophisticated stone structures, developed an advanced numerical system and maintained extensive agricultural complexes. The Aztecs established a far-reaching empire that controlled much of present-day Mexico.
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