What's Most Dangerous Threat to America?

In formulating its defense policy, the United States has to face four separate security challenges simultaneously: China, Russia, Iran, and Sunni jihadism. This is very different from the Cold War era when, although America faced security problems in many parts of the globe, there was one overarching challenge that it confronted throughout the world: the Soviet Union.

The Soviet threat during the Cold War was undoubtedly much greater than any of the four threats that America now faces. The Soviet Union was a global threat, while Russia, China, Iran, and Sunni jihadists are mainly regional threats. Nevertheless, dealing with four separate threats is much more complicated than dealing with just one.