<span>Business and industrialization centered on the cities. The ever increasing number of factories created an intense need for labor, convincing people in rural areas to move to the city, and drawing immigrants from Europe to the United States. As a result, the United States transformed from an agrarian to an urban nation, and the demographics of the country shifted dramatically.
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The transitions were sudden and due of violence, and culturally disruptive
African Americans.........................................................
I believe the answer is ‘TEN MILLION’.