Have you always had PROBLEMS with Mathematics (I teach it BTW). America's debt was 10.5 trillion when King Idiot became president in 2008....and it was 20 trillion, when the idiot finally left 8 years later. TOO MANY ZEROS...is that why you cant get this straight?
It took America approx. 230 years to acquire it's first 10 trillion of debt...and it took your worthless king, EIGHT YEARS to double it. WORST President...certainly most expensive, in the history of America!!!