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THE SINGLE MOST important issue in allocating national resources is war versus peace, or as macroeconomists put it, “guns versus butter.” The United States is getting this choice profoundly wrong, squandering vast sums and undermining national security. In economic and geopolitical terms, America suffers from what Yale historian Paul Kennedy calls “imperial overreach.” If our next president remains trapped in expensive Middle East wars, the budgetary costs alone could derail any hopes for solving our vast domestic problems.

It may seem tendentious to call America an empire, but the term fits certain realities of US power and how it’s used. An empire is a group of territories under a single power. Nineteenth-century Britain was obviously an empire when it ruled India, Egypt, and dozens of other colonies in Africa, Asia, and the Caribbean. The United States directly rules only a handful of conquered islands (Hawaii, Puerto Rico, Guam, Samoa, the Northern Mariana Islands), but it stations troops and has used force to influence who governs in dozens of other sovereign countries. That grip on power beyond America’s own shores is now weakening.

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