28 of the richest Americans in history

Standard Oil founder John D. Rockefeller has long been considered the wealthiest man in America's history, but Elon Musk is now wealthier.

General Photographic Agency/Getty Images / ALLISON ROBBERT/AFP via Getty Images

• America has more billionaires than ever, led by Elon Musk, who's estimated to be worth $744.6 billion.
• Figures such as John D. Rockefeller and Andrew Carnegie were known as the richest men of their time.
• Today's tech leaders, including Musk and Jeff Bezos, are among the richest Americans in history.