According to stephen h. long, what was one benefit of “uninhabitable” great plains?
a. it could act as a buffer zone to protect the u. s. from foreign attacks.
b. it could be used as training grounds for the u. s. military.
c. it was a possible place to send the native americans.
d. it was a good place for a penal colony.

A. It could act as a buffer zone to protect the U.S. from foreign attacks.

Explanation:

Stephen H. Long was an explorer who covered over 26,000 miles in five expeditions which includes what he called the "Great Desert" (also called the Great Plains). He stated that this zone was uninhabitable and recommended to use it as a buffer against the foreign countries, who shared the continent with the United States.