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At Crucial Juncture, Iran Seeks Edge on U.S.  TEHRAN -- A quarter-century after U.S.-Iran relations collapsed, Iranians are angrier and more anxious about U.S. policy than at any time since 1979-81, when the United States took in the deposed and dying shah, Iranian students seized the U.S. Embassy and 52 hostages were held for 444 days. 