In 2011, following the difficulty caused by the Great Recession, S&P Global Ratings (formerly Standard & Poor's) downgraded the long-term credit outlook of the United States from its highest designation of AAA to AA+, citing budgetary issues. High credit ratings are not just handed out. In fact, only two U.S.-based companies maintain the coveted AAA rating from S&P. They may be a good place for investors to park cash as President Donald Trump attempts to shake up the global trade order with sweeping tariffs -- a situation that could turn into a long-lasting trade war if negotiations are not soon reached.