The Industrial Revolution led to overcrowded and unsanitary conditions in urban areas as people migrated to cities to work in factories and mines. New social classes emerged, including industrial workers who faced long hours, dangerous machinery, pollution, and poor living conditions in overcrowded tenements. While unions were initially banned, worker protests grew, including the Luddites who destroyed machinery. Child labor was also common, with many starting work as young as age 5 to support their families. Some reforms followed, but conditions remained difficult for industrial workers.