The dissolution of the Soviet Union in 1991 left the US the sole indisputable world power with almost unlimited resources. However, over the past decade, it has become clear that US resources are not limitless. The Eurasian landmass now contains many competitors with strategies opposed to those of Washington. In a sense, the monolithic Soviet Union was easier to contain than the simultaneous challenges of a rising China, a revanchist Russia, and an ambitious Iran. There are further serious problems to be dealt with, such as terrorism and cyber security. Containment of post-Cold War Eurasia will be no easy task for the US.