There is an idea circulating that the political system in the US is turning into a "neo-feudalism", pushed by a mix of those alt-right "theorists" and some of the new rich.
How much of this "neo-feudalism" shares with actual feudalism is not clear to me.
See
https://www.thedailybeast.com/californias-new-feudalism-bene...
https://www.nationalreview.com/2014/07/new-feudalism-fred-ba...
https://www.huffingtonpost.com/john-w-whitehead/the-age-of-n...