Why did the united states sell arms to iran in the 1980's

The United States sells arms to Iran in the 1980s to release seven U.S. hostages held in Lebanon.  

Explanation:

The United States covertly sell arms to Iran through Isreal to release seven American hostages, held in Lebanon. The whole issue came to know as the Iran-Contra affair. Weapons like antitank missiles exchanged in return for the hostages during Regan administration. The money received by American from selling weapons, used in Nicaragua to support the anti-communist guerrillas who were fighting against the government.

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