Microsoft co-founder Bill Gates has been ranked as the wealthiest person in America for the 14th year in a row. Reported here .
Forbes magazine put Gates' fortune at $59bn, with investment guru Warren Buffet in second place with a net worth of $52bn.
Casino magnate Sheldon Adelson and software tycoon Larry Ellison remained at third and fourth place on Forbes' list of the 400 richest Americans.
Google founders Sergey Brin and Larry Page, come in joint fifth place, with fortunes of $18.5bn apiece.
Investor Kirk Kerkorian his fortune rising by more than $9bn in the past year to $18bn, putting him in seventh place.
The collective net worth of the 400 billionaires totalled $1.54 trillion - more than Canada's GDP.