I TELL MY STUDENTS THAT THE FUNDAMENTAL PURPOSE OF FOREIGN policy is elementary: to convince other countries to do what we would like them to do. To that end, there are various tools at our disposal, which range from making polite requests to sending in the Marines. The incentives we can offer include everything from words of praise to boxes of seeds to shiploads of tanks. We can apply pressure on the recalcitrant by enlisting allies, friends, and international organizations to reinforce our requests. If right is clearly on our side, we can threaten to support economic and security sanctions,
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