From the Congressional Budget Office (CBO), 15 July 2014. "Between 2009 and 2012, the federal government recorded the largest budget deficits relative to the size of the economy since 1946, causing its debt to soar. The total amount of federal debt held by the public is now equivalent to about 74 percent of the economy’s annual output, or gross domestic product (GDP)—a higher percentage than at any point in U.S. history except a brief period around World War II and almost twice the percentage at the end of 2008. If current laws remained generally unchanged in the future, federal debt held by the public would decline slightly relative to GDP over the next few years, CBO projects. After that, however, growing budget deficits would push debt back to and above its current high level. Twenty-five years from now, in 2039, federal debt held by the public would exceed 100 percent of GDP, CBO projects. Moreover, debt would be on an upward path relative to the size of the economy, a trend that could not be sustained indefinitely."

A working paper from the IMF deals with sovereign debt after the 2008 crisis.

From the Congressional Budget Office (5 Febr.2013) : "Economic growth will remain slow this year, CBO anticipates, as gradual improvement in many of the forces that drive the economy is offset by the effects of budgetary changes that are scheduled to occur under current law. After this year, economic growth will speed up, CBO projects, causing the unemployment rate to decline and inflation and interest rates to eventually rise from their current low levels. Nevertheless, the unemployment rate is expected to remain above 7½ percent through next year; if that happens, 2014 will be the sixth consecutive year with unemployment exceeding 7½ percent of the labor force—the longest such period in the past 70 years."