Answer:The Columbian Exchange refers to the exchange of diseases, ideas, food, crops, and populations between the New World and the Old World following the voyage to the Americas by Christo pher Columbus in 1492. The impact was most severe in the Caribbean.
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Europe concentrated on developing its political and cultural institutions. The early years of the middle ages were marked by he absence of an effective central gov't and the constant treat of famine, disease, and foreign invasions
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The WESTWARD Expansion started in 1803
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