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The glacial conditions further north mean that the central plains are at this time cool and moist.During the next 5000 years, while the glacial period continues, humans penetrate far into South America.It develops a steppe-like ecology of grasslands, grazed by large animals such as horses, reindeer and even mammoth.

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But by 3000 BC the people of this area are settled agriculturalists.

In this development they are followed by the hunter-gatherers of south America and then, considerably later, by some in the northern part of the continent.

These hardiest of all human settlers survive today as the Eskimo (or, in their own name for themselves, inuit - meaning simply 'the people').

The cultivation of crops in America begins in the Tehuacan valley, southeast of the present-day Mexico City.

A succession of highly developed cultures, all strongly influenced by the traditions of their predecessors, follows in the same two limited regions of the continent - in central America (also known as Mesoamerica) and in the strip of land between the Andes and the Pacific.

Archaeology provides evidence of these various cultures, but the only ones known about in any great detail are those surviving when the Spaniards arrive - to marvel and destroy.

These are the very ancient Maya, and the relatively upstart dominant cultures of the time, the Aztecs and the Incas.

The original people of north America live in a wide range of environments.

This is a distinction of importance in American history, for there are no animals in America at this time strong enough to pull a plough.

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