During the post-Civil War period of industrialization in the United States:
- Entrepreneurs like Carnegie, Rockefeller, and Edison established monopolies in industries like steel, oil, and electricity through aggressive business practices that eliminated competition.
- The rise of large trusts and monopolies led the government to begin regulating industry under Progressivism to curb their power and abusive practices.
- Other notable industrialists of the time included inventors, manufacturers, and transportation magnates who helped drive economic growth through new technologies and infrastructure projects, though some schemes like Crédit Mobilier involved political corruption.