What Happened To The White Collar Middle Class In The United States From 1900 To 1920 CH 21?

What Happened To The White Collar Middle Class In The United States From 1900 To 1920 CH 21? What happened to the white-collar middle class in the United States from 1900 to 1920? It more than doubled in size and grew at over twice the rate than the work force as a whole during the