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The Anasazi
At the same time, the Anasazi people of the Colorado Plateau had a culture based on agriculture. They built irrigation ditches and farmed on terraces to prevent erosion. They lived in villages tucked into canyon walls and canyon valleys, but by about 1300 AD they vanished mysteriously. Perhaps a terrible 25-year-long drought which began in 1275 AD forced them to move away. Their descendants are the Pueblo Indians of the Rio Grande Valley of New Mexico.
The Woodland Cultures
In the region between the Mississippi River and the Atlantic Ocean, the Woodland Cultures developed in about 3000 BC. Mostly based on trade with Indian groups as far south as the Olmecs of Mexico and north to the Great Lakes, the Woodland Cultures were the first group north of Mexico to build pyramid mounds. [more]
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