When the history of Sino-American relations since 1949 is written in years to come, it will very likely lump together much of the two decades from the Korean War to the Kissinger-Chou meeting as a period of drearily sustained deadlock. Korean hostilities will be blended rather easily into Indochina hostilities, John Foster Dulles into Dean Rusk. The words and deeds of American East Asian intervention, of the containment and isolation of China, will seem an unbroken continuity. And at the end, under most improbable auspices but for commonsense balance-of-power reasons, will come the Zen-like Nixon stroke that cut the Gordian knot and opened a new era.