Sources
http://www.ahistoryteacher.com/~ahistory/apwhreview/index.php?title=The_impact_of_the_Columbian_exchange_on_Europe%2C_the_Americas%2C_and_Africa.
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As new crops were introduced in Europe, food production increased.
European armies in Africa destroyed villages and crops in an effort to prevent their enemies from accessing African resources.
The purpose of the Triangular trade route was so that Africa, American Colonies, and England could exchange their resources for slaves, gunpowder, weapons, and even crops.
The poor people saw so much death they wanted to enjoy life. Serfs began to leave their land and not engage in the planting of crops. Large numbers of the working class died.
Practically all of the textbooks will get into a page or two or ten about the decimation of American Indians, or a page about how important maize is when all European crops fail, and things like that.