EVER since the Nixon Doctrine was enunciated 18 months ago, it has been a subject of widespread debate and frequently an object of widespread confusion. The doctrine has been hailed as an antidote to the sort of thinking that led the U.S. into Viet Nam and scorned as window dressing designed to cover up a hasty retreat. To some allies, it seemed to presage a reneging on past promises. The controversy about the doctrine's eventual results is likely to rage for some time, but one thing has become quite clear: before the 1972 elections,...
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