<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 overall aim was the defeat of the Western European nations as a preliminary step to the conquest of territory in the East, thus avoiding a two-front war. In April 1940, the Germans launched an attack on the neutral countries of Denmark and Norway for strategic reasons.
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France allied with the US in the Revolutionary War
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