Step-by-step explanation:
One impact the railroad had on the American economy was the expansion of national markets. The widespread adoption of railroads in the late 19th century enabled goods and products to be transported efficiently over long distances, connecting previously isolated regions and allowing for the growth of national markets. This allowed for increased trade and commerce between different parts of the country, leading to economic growth and development. Additionally, the construction and operation of railroads created numerous jobs and business opportunities, further fueling the economy.