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

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation: