Petraeus: The next American century
By David H. Petraeus
In fact, Brookings Institution scholar David Dollar has argued that, even if China overtakes the United States in absolute GDP within a couple of decades, the United States may regain the top spot later in the century, especially if China's political model remains autocratic.
Beyond that, our infrastructure - which is central to future productivity gains - needs major improvement. And, of course, climate changes remain a threat, as do Islamic extremist groups and Iran, as well as Russia.
Michael E. O'Hanlon is senior fellow and director of research in foreign policy at the Brookings Institution.