What was a drawback of the columblan exchange?
a.
it led to the spread of diseases in the americas, killing thousands of native americans.
b. it led to the loss of funding for future explorations because the westward route to asla was not found.
c. it led to the destruction of the traditional economy and barter system of native americans.
od.
it led to a rivalry between england, spain, and france in their race to claim american land.

A.  It led to the spread of diseases in the Americas, killing thousands of Native Americans.

Explanation:

The major drawback of the Columbian Exchange was the diseases that Europeans brought to the New World beginning around the 15th century. Diseases like smallpox, malaria, and yellow fever devastated Native American populations and was even responsible for bringing about the demise of entire Native American tribes.

they remained in rural areas and worked at jobs such as lumbering or farming.

the indians crossed artificial boundaries, setting the stage for conflict