Industrialization: The process of transforming an economy from agriculture-based to manufacturing-based, which characterized much of the late 19th century US.
Gilded Age: A term used to describe the period in American history after Reconstruction until about 1900, marked by rapid economic growth but also significant social inequality and corruption.
Progressive Era: A period during the late 19th and early 20th centuries when social reform movements aimed at addressing various societal issues were prominent.