The iraq war represented a departure from the post-1945 american foreign policy of Isolationism.
Isolationism is a political philosophy that advocates a national foreign policy that opposes involvement in other countries' political affairs, particularly wars. As a result, isolationism fundamentally advocates neutrality and opposes participation in military alliances and mutual defense treaties.
When it appeared that Iran was gaining the upper hand in their conflict, the United States made a little shift toward Iraq, which was then seen as the lesser of two evils.
The war between Iran and Iraq ended in 1988. Over the next two years, the United States largely maintained its previous decade's policy.
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