Answer:
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In turn, the railroads had a great impact on the steel industry. ... The rapid rise of the steel and railroad industries between the end of the Civil War and the early 1900s spurred the growth of other big businesses, especially in the oil, financial, and manufacturing sectors of the economy.
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The answer is: Spend it
Reaganomics are sets of economic principles which popularized by Ronald Reagan during his presidency.
According to this principles, If people have more money in their disposal (which can happen if the government reduce income taxes), The consumers will most likelly will spend those money for consumption purpose. As an effect, businesses will thrive and the United States' economy will grow. Creating a more prosperous society.