Gilded Age: A term coined by Mark Twain to describe the late-1800s, highlighting the extreme wealth and corruption that coexisted with poverty and social problems.
Industrialization: The process of developing industries on a large scale, leading to the growth of factories, mass production, and urbanization.
Social Darwinism: An ideology that applied Darwin's theory of natural selection to society, justifying social inequality and opposing government intervention in business affairs.