This document summarizes key aspects of the industrialization of America in the late 19th century. It discusses how technological innovations like electricity drove mass production. It also describes how railroads transformed into large corporations through government assistance and cut-throat practices. As industry grew, cities expanded rapidly as immigrants and rural residents were drawn to new job opportunities. Within cities, immigrant neighborhoods clustered near factories while the wealthy lived in new suburbs. Long workdays in dangerous factories employed many immigrants and children in repetitive jobs. As working conditions deteriorated, laborers increasingly organized strikes and protests to improve wages and hours.