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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I'm pretty sure that popular sovereignty is the idea that power lies with the people. I hope this helps you out :)
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A. Spanish colonies were controlled by the Spanish king; the English had more local control.
A communist state emerged in Russia