FYI Bill gates is no longer the world’s richest man (even before he decided to finally give masser on is money to PETA). The richest man is some dude in Mexico.
America’s richest man was John D Rockefeller who had about fifteen times the fortune of Bill Gates (until he decided to buy a couple of states, and build a house with a couple hundred rooms and twenty plus bathrooms, I believe he used his money more productively than Mr. Gates).