Andrew Carnegie was born in Scotland and he grew up poor with his parents.
at 13, he immigrated to the united states in 1843 and worked his way up the business ladder and gained the attention of the railroad superintendent who offered him a job
Carnegie eventually bought his own steel company called Carnegie Steel
Just like Carnegie, Rockefeler's family had the modest of pay and didn't really have money.
When he moved from Richford, New York to Ohio, he started a Oil company which led the company being the largest and most profitable companies and it made Rockefeller one of the richest men in the world and he was the First Billionaire
During all this, he found the University of Chicago and donated to the rockefeller foundation and with his oil company, it helped run the lightbulb