The United States will remain the world’s most powerful nation for years to come, but the Obama administration and U.S. lawmakers are now focused on debt, immigration, guns and growth. A war-weary, under-employed American public wants results at home, leaving U.S. officials to look for allies willing to share costs and risks abroad. Unfortunately, it’s not easy to build and sustain alliances in a world where America can’t afford its traditional share of the heavy lifting.

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