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Twenty months had now gone by since Nixon’s inauguration, and peace seemed no nearer. Thwarted in his desire to strike a bold blow against the North, frustrated at the continuing impasse in Paris, and angered by the antiwar demonstrations that had undermined his ultimatum, the president searched for another opportunity to make the kind of dramatic show of force he thought would force Hanoi to make the concessions that would lead to peace. Cambodia would provide it.
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Geoffrey C. Ward (The Vietnam War: An Intimate History)