What was a drawback of the columbian 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 asia was not found.
c.
it led to the destruction of the traditional economy and barter system of native americans.
d.
it led to a rivalry between england, spain, and france in their race to claim american land.

Right option:

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

Explanation:

The Indian peoples of the New World didn´t have anti-bodies that could help resist illnesses that were brought by the Europeans such as the smallpox. These new viruses and bacteria decimated Indian people. Not thousands, but millions of Indians died because of new diseases spread by the Europeans colonizers.

codfish influenced the yankee trade because they traded it with the americans and the americans traded livestock, molasses and stuff that they can make clothes out of (like wool, and leather). they also could make weapons to.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain