Total number of child workers in the United States in 1870: 850,000⁵
Total number of child workers in the United States in 1900: 1.7 million⁶
Total number of industrial workers in the United States in 1900: 20 million⁷

Number of college-educated women in the United States by 1900: over 80,000⁸

Percentage of American women employed as office workers or telephone operators in 1920: 25%⁹
Percentage of American women employed in domestic service in 1920: 15%¹⁰
Number of women working for wages in 1920: 8 million¹¹
Percentage of wage-earning women who were married and living with their husbands in 1920: 25%¹²

Proportion of the American population living in cities in 1900: 1/3¹³

Americans employed in the trade and service occupations in 1910 (not all of them white collar workers): less than 2 million¹⁴
Americans employed in the trade and service occupations in 1910 (not all of them white collar workers): over 7 million¹⁵

Number of Americans living in cities in 1910: 42 million¹⁶
Number of Americans living in cities in 1910 who had migrated from rural parts of the U.S. after 1880: 11 million¹⁷

Number of people arrested in the Justice Department's "Palmer Raids" (named for Attorney General A. Mitchell Palmer) from 1919–1920, most of them detained without an arrest warrant: over 5,000.¹⁸