The US is a country of advocacy groups, lobbyists, and power wings; and the minutest political move in such a country will have great international reverberations.
No least so the US relations with Iran, where every nuance will be strenuously followed by the opponents of such relations.
Political commentator Noam Chomsky regarding the pro and con sides of such relationship says that no doubt the relations will be to the benefit of a great number of the American society, yet against the interests of many others.
He says that the general population, energy corporations, and exporters are the winning side if relations between the two countries grow.
He adds meanwhile that state powers, which function in the style of the mafia, as well as jingoists and ultranationalists will see their interests threatened by strengthening Iran-US relations.