Indeed, the main impediment to normal relations between Iran and the United States since the 1979 Islamic Revolution has been the mutual mistrust between the two sides. Iran, for its part, has a long list of legitimate grievances. The U.S. supported Saddam Hussein in the conflict that began with his invasion of Iran in 1980, sparking an eight-year war that cost the lives of over 300,000 Iranians and resulted in an estimated $1.19 trillion in damage to both sides. During the war, the Iraqi army used chemical weapons against Iran, killing and injuring over 50,000 civilians.
The Iran nuclear talks saw for the first time Iran and the United States engaging in serious negotiations at the highest levels after over 35 years of hostility. An Iranian foreign minister and a U.S. secretary of State sat down and directly talked with one another to resolve one of the most pressing international crises.
In terms of abiding by its commitments under the nuclear deal, known as the Joint Comprehensive Plan of Action (JCPOA), Iran has done a commendable job. According to U.S. Secretary of State John Kerry, Iran has implemented its commitments under the agreement in a timely manner, including recently completing the process of shipping out of the country its 11,000 kg stockpile of low-enriched uranium. Neither the IAEA nor the P5+1 group of nations have ever publicly found Iran to be in violation of either the Nov. 2013 interim deal or the JCPOA.