Which are reasons that the United States became a leader of industry after Reconstruction? (Select all that apply.)

Question

growth of factory production
growth of mining expeditions
growth of railroad construction
growth of the automobile industry
growth of oil production

I think the answers are 1, 2 and 3 but I am not sure because it doesn't specifically say in my texts what caused America to become a leader of the industry after the reconstruction

Answer 1

I agree with your answers. Oil production and automobiles came long after Reconstruction.