More railroads lead to lesser land for crop cultivation and raising of livestock! hence, farmers are unable to earn profit from their activities.
The answer is 'Railroads'
The Industrial Revolution in England lead to the development of trains and fast travel.
The United States quickly adopted the technology and brought in English businessmen and engineers to develop railroads in it's sprawling western states.
Railroads were integral in the early years in to cement newly acquired states under the control of the Federal government.
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In the 1920s, assembly line production made it incredibly easy for Americans to access new consumer goods. Rising earnings gave more disposable income to be able to purchase the goods, as well as affordable automobiles and devices that people would need and want. Many people started living the desired life they wanted with affordable products. Advertising became as big as the industry they were representing because people paid more attention to the products they could generally afford. It was a head start during the industrial expansion.
