WASHINGTON (AP) — In a chilling forecast, the White House is predicting a 10-year federal deficit of $9 trillion — more than the sum of all previous deficits since America’s founding. And it says by the next decade’s end the national debt will equal three-quarters of the entire U.S. economy. But before President Obama can do much about it, he’ll have to weather recession aftershocks including unemployment that his advisers said Tuesday is still heading for 10 percent.