When Americans look out at the world, we see a swarm of threats. China seems resurgent and ambitious. Russia is aggressive. Iran menaces our allies. Middle East nations we once relied on are collapsing in flames. Latin American leaders sound steadily more anti-Yankee. Terror groups capture territory and commit horrific atrocities. We fight Ebola with one hand while fending off Central American children with the other. In fact, this world of threats is an illusion. The United States has no potent enemies. We are not only safe, but safer than any big power has been in all of modern history. It will be generations before China is able to pose a serious challenge to the United States - and there is little evidence it wishes to do so. Russia is ... not always a friendly neighbor but no threat to the United States. Violence in the Middle East has no serious implication for American security. As for domestic terrorism, the risk for Americans is modest: You have more chance of being struck by lightning on your birthday than of dying in a terror attack. Promoting the image of a world full of enemies creates a security psychosis" that misshapes our view of the world. In extreme cases, it pushes us into wars aimed at preempting threats that do not actually exist. Arms manufacturers profit from the security psychosis even more directly than militarists. Finding new threats is always good business for someone.