The United States faces a rising future ratio of debt to GDP that, if allowed to continue, would have serious adverse consequences for the American economy. Fortunately, policy changes can increase the size of the future GDP and shrink the future budget deficits. Relatively small reductions in future annual deficits could reverse the increasing ratio of national debt to GDP. Those annual deficit reductions could be best achieved by slowing the growth of Social Security and Medicare and by raising revenue by limiting tax expenditures or increasing the tax on gasoline.