Industrial Revolution: The period of rapid industrialization in the 18th and 19th centuries that transformed America from an agrarian society to an urbanized industrial one.
Civil Rights Movement: A social movement during the mid-20th century aimed at securing equal rights for African Americans and other marginalized groups.
Manifest Destiny: The belief in the 19th-century that it was America's destiny to expand its territory from coast to coast, influencing westward settlement and expansion.