<span>According to Robert Kraske, two ways the profits of the salt trade affected the city of Timbuktu was that it increased GDP and increased trade revenue. </span>
In addition to plants, Europeans brought domesticated animals such as cattle, sheep, goats, pigs, and horses. Eventually, people began to breed horses, cattle, and sheep in North America, Mexico , and South America . ... In North America , the horse dramatically changed how many Native Americans lived.
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Irrigation was overused, the soil didn't get any rest (crop rotation is a younger invention), the result was salinization of the soil, which led to decline of Sumer.
This is because after winning independent slave trade also was in that event, or because Europeans wanted to influence Christians into Africa.
