Industrial Revolution: A period from about 1760 to sometime between 1820 and 1840 when major changes occurred in agriculture, manufacturing, mining, transport, and technology that had a profound effect on socioeconomic conditions.
Steel Industry: The business of processing iron ore into steel, which is a stronger and more durable metal. This industry was particularly important to cities like Pittsburgh.
Blue-Collar Workers: Workers who engage in hard manual labor, typically in industries such as manufacturing or construction. These workers were essential to cities like Pittsburgh during the Industrial Revolution.