Answer :
The correct answer is expanding production and consumption within the United States
With the investments in the transportation sector, the development of highways, Erie Canal, and others cut the costs of freight transport by 95 percent and it contributed a lot to the expansion and consumption within the US. This was called “transportation revolution” by historians this knitted the economy on an unprecedented scale. This developed an integrated national market that helped fuel mass production. At the end of the 19th century, national distribution expanded and households relied less on the local retailer’s assessment of a particular product. Many outlets emerged, chain stores, department stores, mail-order houses.