On November 9, 1989, a mob of jubilant Berliners dismantled the wall that had divided their city for nearly forty years; this act of destruction anticipated the momentous demolition of the European communist system. Within two years, the nations of the former Eastern Bloc toppled their authoritarian regimes, and the Soviet Union ceased to exist, fading quietly into the shadows of twentieth century history and memory. By the end of 1991, the United...