Soviet Communism, the dark tyranny that controlled nearly 40 nations and was responsible for the deaths of an estimated 100 million victims during the 20th century, suddenly collapsed 20 years ago without a shot being fired. In just two years--from 1989 to 1991--the Berlin Wall fell, the Soviet Union disintegrated, and Marxism- Leninism was dumped unceremoniously on the ash heap of history. There was dancing in the street and champagne toasts on top of the Brandenburg Gate. For 40 years, the United States and the West had been following a policy of containment, détente, accommodation. Ronald Reagan decided it was...