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== = = =Unit 1 Reconstruction 1860-1877 = =Unit 2 Western Frontier 1877-1900 = =Unit 3 Industrialization & Immigration 1870-1914 = =Unit 4 Progressivism & Imperialism 1890-1920 = =Unit 5 WWI 1914-1918 = =Unit 6 Roaring Twenties 1920-1929 = =Unit 7 Great Depression 1929-1940 =