Final answer:
The Columbian Exchange introduced new crops and livestock to Europe, aiding population growth, but had devastating effects on Native Americans through disease and changes in warfare.
Step-by-step explanation:
The Columbian Exchange had both positives and negatives effects on Native Americans and Europeans. Two positive effects felt by Europeans included the introduction of new crops such as maize, potatoes, and cassava, which helped to feed growing populations and facilitated the expansion of cities and industries. On the other hand, European animals thrived in the Americas, providing a new source of animal protein to diets, thus contributing to population expansion.
However, the negatives for Native Americans were particularly severe. Not only did the introduction of European diseases lead to a catastrophic decline in their populations, but changes in warfare due to new weapons like guns made conflicts more deadly. Furthermore, Europeans benefited financially from the fur trade at the expense of the Indigenous people's welfare and societal balance.