#10 Cornelius Vanderbilt - Net Worth $185 Billion
Cornelius Vanderbilt is the third richest American ever, the 10th richest person in history and CNN anchor Anderson Cooper's great-great-great-grandfather. Cornelius Vanderbilt made his first fortune in the steamboat industry but didn't see his wealth really explode until he invested in railroads at the age of 70. When he died, his estate was worth the equivalent of $185 billion.