Chasing for money rarely is successful, though. Inheriting a fortune is a way which worked for many of the rich, though. For some it was work on a good idea and producing a good product.
Most rich people in the US didn't inherit much money, they had to build it. A few prominent super wealthy did, but for the most part it is create it yourself.
This is false; people end up with tons of money all sorts of different ways, from inheritance, to luck, divorce, lawsuits, hard-work hustling and grinding, or even criminal activity like fraud or embezzlement.
You generally can't know for certain, except in some cases such as a public figure. Lots of people expend vast amounts of energy projecting the image of wealth in a [pathetic] attempt to gain status, and they're faking it to the max.