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.
Railroads also led to an "increase in the demand for raw materials" since after the railroads were implemented people were able to build more factories that demanded these materials.