This document provides an overview of the history of labor unions in the United States from the early 19th century through the mid-20th century. It discusses early union development being stunted until the 1930s due to widespread anti-union sentiment among Americans and employers. The document then covers key events that shaped the labor movement such as violent strikes in the 1870s-1890s, the rise of national unions in the late 19th century, and pro-union legislation passed during the Great Depression in response to widespread economic hardship.