Answer:
It allowed for the creation of national markets and made it easier to transport goods.
Step-by-step explanation:
The development of railroads across the US revolutionized the economy. With the creation of railroads, businesses could now sell their goods to a national market. Instead of just selling their products in local markets, businesses had the opportunity to expand and sell their goods all over the US.
Along with this, the transportation of goods became extremely cheap compared to the pre-railroad days. The ability to ship goods cheapily also resulted in increased access to goods and resources for citizens all over the US.