Which trend was observed in the United States between 1865 and 1900 due to rapid industrialization?

The correct answer highlights the significant rise in union membership during the period of rapid industrialization in the United States from 1865 to 1900. As industries expanded and factories proliferated, many workers faced long hours, low wages, and unsafe working conditions. This environment fostered dissatisfaction among workers, prompting them to seek collective action through unions to advocate for better pay, safer working conditions, and reasonable work hours.

The growth of the labor movement during this time was marked by the establishment of numerous labor organizations, including the Knights of Labor and the American Federation of Labor. These unions played a crucial role in mobilizing workers and organizing strikes to achieve their demands, highlighting the connection between industrialization and growing labor unrest.

Understanding this trend is essential as it reflects broader social changes and the struggle for workers' rights within the context of America's industrial growth. The increased union membership served as a response to the pressures created by industrial capitalism, and it set the stage for future labor reforms and the eventual establishment of more regulated work environments.