Effects of the Columbian Exchange
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Before the Columbian Exchange their were almost no large domesticated animals in the America's. Old world settlers brought horses, cattle, sheep chickesnsand pigs.
New world crops like corn and potatoes provided more calories , and could easily grow in dry soil and usually were resistant to pests
Native Americans used horses for transportation & hunting more effectivly
European weeds and grasses took over large areas
Many native forests were destroyed and displaced by other native tribes
Native Americans had no immunity to diseases, and died from diseases such as measles, influenza, and small pox.