(Bloomberg) -- The pristine universe of triple-A rated countries got a whole lot smaller this week after the US was stripped of its top-tier rating.Most Read from BloombergTrump Cites Self Incrimination Concern in Lawsuit Against CohenS&P 500 Wipes Out Almost 1% Gain; Bond Yields Drop: Markets WrapElon Musk Says Treasury Bills Are ‘No-Brainer’Apple Faces Longest Sales Drop in Decades as iPhone SlumpsCredit Suisse Collapsed, And Switzerland Went Back to Making MoneyIt’s the latest example of a de