There's many more Europeans who still live and own land worth billions inherited across generations, from centuries ago, than there are Americans in the same position.
In Austria, the top 100 richest families own 2/3 of the country's wealth, and spoiler alert, non of those are recently minted tech billionaires, but wealthy heirs from land and 100 year old businesses.
In Australia (like Austria but with more letters and less culture) they have Vogon poets:
https://genius.com/Gina-rinehart-our-future-annotated
https://www.abc.net.au/local/stories/2012/02/15/3431797.htm
estimated net worth > $27 billion.