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It seized fifty-two American hostages
When the US did not return former Shah Mohammed Reza Pahlavi in 1979, the American embassy in Iran was attacked and several of its members were taken hostage for 444 days. This has been termed the "Iran Hostage Crisis."
After he was deposed as Shah of Iran, Mohammed Reza Pahlavi needed surgery and he came to the United States to get this surgery performed. During that period the Iranian Leadership demanded that the United States extradite the Shah to Iran where he would face a kangaroo court and certain execution. The United States refused, thus protecting him.
Local authorities refused to recognize the citizenship of the affranchis
The Iranians overran the US Embassy because the US refused to repatriate the Shah to Iran for a trial (likely a kangaroo court and execution). Canada and Britain were not complicit with that policy, so their embassies were not overtaken.
He refused to allow the country as a Soviet-British Oil route. Therefore the UK and USSR launched a coup d'état to overthrow him.
Has refused, has forbidden, has refused
It was one of the Intolerable Acts that American Colonists refused to accept.
It started it. The UK demanded that it be withdrawn. The Rebels refused.
It was about how America could benefit from it by setting up the Panama Canal after Colombia refused to grant them the land.
The Soviet Union had nothing to do with the particular issues that Iran was dealing with. The Iranians overran the US Embassy because the US refused to repatriate the Shah to Iran for a trial (likely a kangaroo court and execution). The Soviet Union was not complicit with that policy, and actually had funded much of the non-religious opposition to the Shah (which was Communists liked the Tudeh Party). As a result, there was no reason to anger the Soviets.
Because that heeded George Washington's advice to avoid involvement in European affairs.