Final answer:
Columbus's contributions to world history encompassed initiating the Columbian Exchange, establishing links between the Western and Eastern Hemispheres, and impacting global trade.
Explanation:
All of the above are valid contributions of Columbus to world history. Columbus's voyages initiated the Columbian Exchange, which led to the exchange of goods, animals, and diseases between the New World and the Old World. Additionally, his expeditions laid the foundation for establishing permanent links between the Western and Eastern Hemisphere, ultimately impacting global trade and exploration.
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