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The debate over whether or not the United States is in decline is more than just a parlor game among pundits and academics, as the answer to that question informs starkly different policy choices for the country. For significant portions of the anti-interventionist left and right -- the latter represented by the small but vocal constituency of GOP presidential candidate Rep. Ron Paul -- a United States that is in decline ought to cut back on its engagements abroad and avoid playing the role of the world’s policeman, and instead focus on rebuilding America’s domestic institutions, particularly its economy. While President Barack Obama faces no challenger for the Democratic nomination, this “fix America first” sentiment is strong among key segments of his own core...