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The triangular trade was a historical term indicating trade among three ports of regions. Trade usually evolves when a region has export commodities.
They were freed by there slaveholders
On November 4, 1979 a group of Iranian students took more than 60 American hostages in the US Embassy in Teheran.
President Carter applied economic and diplomatic pressure: oil imports from Iran were ended and around $8 billion of Iranian assets in the US were frozen. On April 7, 1980 President Carter ordered all Iranian diplomats to leave the United States. The Carter administration forbade Americans to travel to Iran, but didn`t forbade all Americans to travel anywhere in the Middle East.
Answer: 1. Forbade all Americans to travel anywhere in the Middle East.