From this point of view, the Cold War was not won between 1989 and 1991. It was won between 1956, when the Hungarian masses revolted against communism, and 1961, when the East German communist state confessed that the only way it could stop its population from running away to a better life in West Germany was by building a giant prison wall to keep them in. From that moment, Soviet communism as an ideological model in Europe was dead.
It was not yet dead in the former colonial world; and its expansion there, in alliance with anti-colonial nationalism, continued to give it the appearance of strength. But in the end, Vietnam, Angola, Afghanistan, and elsewhere did not really matter. What mattered to Washington were the great economic centres of Western Europe and maritime East Asia. For these, the United States would have been prepared to risk nuclear war. And for Moscow, the vital interest was Eastern Europe, on the borders of the USSR itself. Recognizing these vital interests of the other side, neither side challenged them.