By 1990, the first Cold War was ending. The Berlin Wall had fallen and the Warsaw Pact was crumbling; following Russia's lead, cries for democracy were being embraced by a young Chinese populace. The post-Cold War years were a time of immense hope and possibility. They heralded an opportunity for creative cooperation among nations, an end to ideological strife, perhaps even the beginning of a stable international order of liberal peace. But...