Courtesy Reuters

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What is the national interest? This is a question that I took up in 2000 in these pages. That was a time that we as a nation revealingly called "the post-Cold War era." We knew better where we had been than where we were going. Yet monumental changes were unfolding -- changes that were recognized at the time but whose implications were largely unclear.

And then came the attacks of September 11, 2001. As in the aftermath of the attack on Pearl Harbor in 1941, the United States was swept into a fundamentally different world. We were called to lead with a new urgency and with a new perspective on what constituted threats and what might emerge as opportunities. And as with previous strategic shocks, one can cite elements of both continuity and change in our foreign policy since the attacks of September 11.

What has not changed

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