What was the overall impact of the columbian exchange

New food and fiber crops were introduced to Eurasia and Africa, improving diets and fomenting trade there. In addition, the Columbian Exchange vastly expanded the scope of production of some popular drugs, bringing the pleasures and consequences of coffee, sugar, and tobacco use to many millions of people.Though there were positive effects, the Columbian Exchange had a long-lasting negative impact. Christopher Columbus's arrival in the Americas facilitated the exchange of plants, animals and diseases between the Old and New Worlds.

Explanation:

the results of roman expansion produced social conflict and civil war. julius caesar gained power and became a dictator but was then assassinated. the reign of augustus began a long period of imperial rule and peace in the roman empire. rome faced the problems of how to maintain peace, law, and order.

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brainliest?

i think the answer is: cuba wanted to be independent from spain, and the u.s. wanted to end spanish rule in the west.

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-lavira : )