Most of it is being financed from China in 1 month issues. The Chinese governement initially stated they were discontinuing purchasing such debt (about 2 weeks ago they officially said this) because it was no longer a wise investment, but they suddenly changed their mind and agreed to go ahead and "invest" in our debt anyway. So theoretically, China is going to underwrite almost a trillion dollars (more) debt of American money. Go figure.
Total value of goods and services produced in the USA in one year: about $13 trillion
Total USA debt (official): about $16 trillion ($3 trillion from the last 3 months alone)
Yes, we are going to spend our way out of debt.