How was the Nixon Doctrine different from previous diplomatic actions taken by the United States in global geopolitics?

Question

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The Nixon Doctrine marked a shift in U.S. foreign policy by stating that the United States would assist in the defense and developments of allies and friends, but would not undertake all the defense of the free nations of the world. This meant that countries were expected to primarily be responsible for their own security, a departure from earlier policies where the U.S. might have committed extensive military resources to defend allies.

How Was the Nixon Doctrine Different from Previous Diplomatic Actions