Forbes has released it latest Forbes 400 list ranking the richest Americans, and surprisingly public figures like former US president Donald Trump and media mogul Oprah Winfrey didn't make it to the list this year. The minimum net worth required in order to join the 2021 list was $2.9 billion, whereas it was only $2.1 billion for the last 3 years. And because of that increase, 51 billionaires were dropped ...