Final answer:
The Gilded Age in America was marked by rapid industrialization, corporate power, and economic expansion, but not widespread electrification, which came later.
Step-by-step explanation:
The period known as the Gilded Age in America was characterized by rapid industrialization, economic expansion, and a concentration of corporate power due to influential figures such as Andrew Carnegie and John D. Rockefeller. The Gilded Age also saw the beginnings of corporate mergers and the formation of monopolies. However, widespread electrification does not accurately describe this time because, although there were significant innovations in electricity, these developments did not become central to American life and industry until the turn of the century.