Railroads not only led to an increase in the ability to transport raw materials but they also led to

Increase in the demand for raw materials.

Explanation:

The Railroads had a very important role in the economic history of the US. The railroads increased the demand of the American industry because it made transportation easier so increased the demand for new products which eventually led to an increase of the capacity of the industries. All of this at the end increased the demand for raw materials for the production of the goods.

a.tensions between the colonial elites and the backcountry men of virginia.