What led to the rapid growth of the railroad industry in the United States in the second half of the nineteenth century?(1 point)%0D%0AResponses%0D%0A%0D%0Athe discovery of oil in the American Southwest%0D%0Athe discovery of oil in the American Southwest%0D%0A%0D%0Athe development of the creosote wood-treatment process%0D%0Athe development of the creosote wood-treatment process%0D%0A%0D%0Athe development of the Bessemer steel-making process%0D%0Athe development of the Bessemer steel-making process%0D%0A%0D%0Athe discovery of coal deposits in West Virginia
1 answer
the discovery of coal deposits in West Virginia
1 answer