I am completely puzzled regarding the involvement of the U.S.A. in the affairs of Iran.  It seems that the U.S. somehow managed to overthrow the government in power when they wanted the Shah in power.  

However, when the Shah was overthrown, Iran managed to take U.S. hostages.  President Carter was then in power and repeatedly tried to free the hostages, but everything went wrong.  Carter said he would never bow to hostage demands.

Then along came Ronald Reagan.  Miraculously, he managed to get the hostages free while mouthing the claim he would not bow to the demands of hostage takers.  Then the secret deal leaked out that he had indeed bowed to their demands.  Nevertheless, it didn't hurt Reagan's "tough guy" image.

Reagan was the Teflon president.  Nothing negative that Reagan ever did stuck to him.  Reagan boasted about a "balanced budget" and instead succeeded in tripling the national debt.  All budget promises were forgotten as they named Washington's National Airport after Reagan.