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19世纪末20世纪初，美国社会进入了重要的转折期，商业模式和社会结构开始发生翻天覆地的变化。新的印刷术及造纸技术扩大了纸媒的影响力，媒体开始左右人们的生活；工业革命改变了原有的城市格局，社会阶层悄悄发生了变化；移民文化融入了美国主流文化，城市的包容性和开放性不断增强。城市的蓬勃发展成为美国繁荣发展的缩影，并默默地影响着美国的未来。

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