[adventured]

The US is still one of the very few countries where a lower-class person can become a billionaire.

I can name about three to four dozen recently listed (Forbes 400) US billionaires that came from poverty. You can look them up, the lists are easy to Google. Further, according to Forbes about half of their real estate billionaires come from at or below middle class, and about 40% of tech billionaires do.