[FOXNEWS] Greece's debt crisis sent shivers through American stock markets Monday, a day after Greek voters rejected demands from international creditors for further austerity measures in exchange for a bailout of its bankrupt economy.The Dow Jones Industrial Average fell more than 100 points after the opening bell, at one point hitting its lowest level since early February, before recovering much of the losses, dipping below 45 points at 12 p.m. EST. The dip followed plunges by markets in Europe and around the world as the government of Prime Minister Alexis Tsipras struggled to find its way through the crisis, which included the resignation Monday morning of Finance Minister Yanis Varoufakis.