The passage summarizes key developments during the Machine Age from 1877-1920. It discusses the shift from agricultural to industrial work and the rise of cities as factories replaced farms. New immigrants provided a source of industrial labor. Transportation innovations like streetcars, subways, and railroads expanded cities. Factories used machines and scientific management to increase productivity but stripped workers of autonomy and dignity. Unions faced challenges from new technologies. Immigrants faced poor living and working conditions in urban tenements and factories. The rise of large corporations transformed the economy and legal system to favor businesses over individuals.