Presidents from Roosevelt to Obama have sought to help allies protect themselves and to engage in collective defense against common dangers. We did this not in a spirit of charity but because we had learned the hard way that problems abroad, if unaddressed, could, before long, imperil us. This job of international leadership is not the kind of assignment one ever finishes. Old dangers rarely go away completely, and new ones appear as regularly as dawn. Dealing with them effectively has never been a matter of just money and might. Countries and people must join forces, and that doesn’t happen
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