(h/t Boker Tov) Doug Ross:
As the chart shows, America's debt is currently $15.1 trillion, while the Eurozone (which includes France, Germany, Greece, Italy, Spain, the U.K., and others) has a combined debt of $12.7 trillion. (All dollar amounts are in U.S. dollars, and the data refers to closing 2011 numbers.)
What policies are responsible... because obviously nationality has little to do with the issue. The debt has risen starting with Clinton, W Bush and Obama, though Obama's debt is about double of Bush's and Clinton's.