In 1856, an agreement was concluded between Iran and the United States. As the first formal treaty between the two countries, the called “Treaty of Friendship and Commerce” bestowed on American nationals some overseas rights. In 1883, Samuel Benjamin arrived Tehran as the first American ambassador to Iran and some 5 years later Haj Hussein Qoli Khan took the same role on behalf of Iran. In the late summer of 1941, the US occupied Iran accompanied by other Allied powers.
With increased expansionist tendencies of the US in the post World War II era, it avidly promoted its influence in Iran so as with planning and executing the coup of August 19, 1953, it could take socio-political destiny of Iran in his hands till the victory of Islamic Revolution. It founded gruesome SAVAK supervised by the CIA and by implementing Land Reforms in the 1960s, paved the way for creation of a mass market for Western and especially American commodities. With depredation of Iranian oil resources in return for the sale of weapon and consumer goods, the US propelled Iran towards increasing dependence so as the imposition of disgraceful Capitulation disclosed the political dimensions of this dependence more than ever.
Although the victory of Islamic Revolution foreclosed the US base in Iran, but its interferences and conspiracies never came to an end. Following the seizure of the US den of Espionage in Tehran by Muslim Student Followers of Imam’s Line and exposure of its role for espionage on Iran, the US found the foundations of its power shaken, so it expanded its efforts to encounter Islamic Revolution. Along these lines, the US cut off diplomatic relationship with Iran on April 7, 1980, and attempted many other abortive conspiracies against Islamic Republic inclusive of military attack on Tabas, Nojeh coup, the imposed war, economic sanctions, etc.