The richest American ever is widely considered to be John D. Rockefeller, the Standard Oil magnate, whose peak wealth (around $1.4 billion in 1937) represented an astounding 1.5% of U.S. GDP, equivalent to roughly $400-$500 billion in today's terms, making him proportionally richer than modern billionaires like Jeff Bezos or Elon Musk, though Musk has recently challenged these historical figures in raw dollar terms.
No one in the history of the world has ever amassed $1 trillion in wealth before. But that looks like it's about to change—soon.
Musa himself further promoted the appearance of having vast, inexhaustible wealth by spreading rumors that gold grew like a plant in his kingdom. Encyclopedia Britannica states that he is "widely considered to be the wealthiest person in history".
Yes, the Rockefellers are still very wealthy as a family, though their immense fortunes from John D. Rockefeller's Standard Oil have been dispersed over generations, now valued collectively at around $10 billion among hundreds of descendants, funding vast philanthropic efforts and maintaining significant, comfortable lifestyles. While no single heir approaches the original patriarch's wealth, the family's wealth management through trusts, insurance, and strategic investing has successfully preserved substantial generational riches, shifting their influence from raw financial power to cultural and philanthropic leadership.
In today's dollars, the Rothschild's were worth $360 billion and the Vanderbilts were worth around $215 billion. If you don't know the names of your great grandparents, it's probably because they didn't leave you any money.
The world's 10 richest families
Elon Musk on track to become first trillionaire.
His estimated net worth would be around $499 billion today, when adjusted for inflation. Elon Musk's current wealth, however, is understood to have now eclipsed that of Rockefeller's. On December 29, Forbes estimated Musk's fortune to be $744.6 billion.
Key Takeaways
Elon Musk closer to becoming first-ever trillionaire as he marks major milestone. The Delaware Supreme Court rules to reinstate his 2018 Tesla stock options worth $139bn, taking his net worth past an unprecedented $700bn.
In its 2018 and 2019 billionaires rankings, Forbes estimated Trump's net worth at $3.1 billion. (In 2018, this was 766th in the world, 248th in the U.S.
Shayne Coplan, the founder and CEO of premier prediction market Polymarket, is the youngest self-made billionaire at 27-years-old, according to Bloomberg.
In 1882, Standard Oil Trust created a network of Standard Oil companies throughout the country, led by a board of trustees, where Rockefeller owned over one third of the certificates. By the late 1880s, Standard Oil controlled 90% of American refineries.
They've accumulated fortunes in various ways, including publishing, cosmetics, retail, and hotels. The richest families in the US include the Waltons, the Kochs, the Hearsts, and the Lauders.
Cornelius Vanderbilt amassed a fortune of $100 million dollars by time of his death in 1877. This translates to just over $2.5 billion in today's money.
Mansa Musa (1280 - 1337)
Mansa Musa is, in fact, the richest person in history, with a wealth that is incomprehensible. Mansa Musa was the 9th ruler of the Mali Empire, who made the economy so powerful that he controlled more money than the rest of the world combined; it was said to be incomprehensible.
The richest woman in the world, as of late 2025 reports, is generally Alice Walton, heiress to the Walmart fortune, with figures placing her net worth well over $100 billion, followed by Françoise Bettencourt Meyers & family (L'Oréal), Julia Koch & family (Koch Industries), and Jacqueline Mars (Mars Inc.). Walton's wealth comes from her inheritance of Walmart stock, while the others' fortunes stem from major retail/consumer goods empires and industrial conglomerates.
Henry Ford: second-generation immigrant, entrepreneur, and founding father of one of America's most famous companies. By making cars affordable for the masses, he built up a fortune that would be worth around $200 billion (£162bn) today – but what happened to all that money after he died in 1947?
Elon Musk has publicly stated he has Asperger's syndrome, a form of autism, which he disclosed during his 2021 appearance on Saturday Night Live. He described his traits as including taking things literally, struggling with social cues, and finding reward in intense focus, suggesting it aids his work. His comments sparked conversations about autism and how individuals, particularly high-profile ones, experience it.
As of late 2024 and into 2025, Elon Musk became the first person to surpass a $400 billion net worth, primarily driven by the rising values of SpaceX and Tesla and his AI venture xAI. While fluctuations occur, he consistently ranks as the world's richest person, with figures showing his wealth significantly exceeding other billionaires like Jeff Bezos.
June 7. In a morning interview with NBC News on June 7, Trump stated that he did not wish to reconcile with Musk, and added that Musk would face 'very serious consequences' if he funded Democrats. Trump also mentioned having saved Musk's life during his first administration.
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