The time period from 1801-1900 in the history of the United States, spanning most of the 19th century.
Related terms
Manifest Destiny: The belief that it was America's destiny to expand westward and spread its democratic values.
Transcontinental Railroad: A railway system spanning across the continent that connected the East Coast with the West Coast.
Second Industrial Revolution: A period of rapid industrialization in the late 19th century characterized by advancements in steel production, electricity, and transportation.