U.S. policymakers need to avoid two mistakes, while seizing two opportunities. The first mistake would be an overreliance on military force. As the United States has learned to its great cost in Iraq -- and Israel has in Lebanon -- military force is no panacea.... The second mistake would be to count on the emergence of democracy to pacify the region. It is true that mature democracies tend not to wage war on one another. Unfortunately, creating mature democracies is no easy task, and even if the effort ultimately succeeds, it takes decades. In the interim, the U.S. government must...