Question

railroads not only led to an increase in the ability to transport raw materials, but they also led to a(n) decrease in the need for raw materials. increase in the demand for raw materials. decrease in the uses of raw materials. increase in the types of raw materials found in the united states.

Explanation:

Railroads expanded market access for finished goods made from raw materials. This broader reach allowed producers to sell more products, which in turn created a higher demand for the raw materials needed to manufacture those goods. The other options are incorrect: railroads did not reduce need/uses of raw materials, nor did they directly increase the types of raw materials present.

Answer:

B. increase in the demand for raw materials.