Due May 8
What was the most important effect of the
Columbian Exchange?

Explanation:

here are my notes

the widespread transfer of plants, animals, culture, human populations, technology, and ideas between the Americas and the Old World in the 15th and 16th centuries, related to European colonization and trade after Christopher Columbus's 1492 voyage

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answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;