Twenty years ago, Ronald Reagan ordered American troops to invade Grenada and liberate the island from its ruling Marxist dictator. By itself this would have been an insignificant military action: Grenada is a tiny island of little geopolitical significance. But in reality the liberation of Grenada was a historic event, because it signaled the end of the Brezhnev Doctrine and inaugurated a sequence of events that brought down the Soviet empire itself.
The Brezhnev Doctrine stated simply that once a country went Communist, it would stay Communist. In other words, the Soviet empire would continue to advance and gain territory, but it would never lose any to the capitalist West. In 1980, when Reagan was elected president, the Brezhnev Doctrine was a frightening reality. Between 1974 and 1980, while the United States wallowed in post-Vietnam angst, 10 countries had fallen into the Soviet orbit: South Vietnam, Cambodia, Laos, South Yemen, Angola, Mozambique, Ethiopia, Nicaragua, Grenada and Afghanistan. Never had the Soviets lost an inch of real estate to the West.