The 1953 coup [1] probably has something to do with that, followed by the hostage crisis in 1979 [2], and the downing of an Iranian passenger airplane by the US [3].
The coup was an American failure caused by meddling into other people's affairs. This is not the first time nor Iran is the only nation where Americans have tried that.
Iran-USA relationship seems complete irrational to me. It is as if the establishment in Washington and Tehran have some sort of gain from keeping things as bad as they are.
Japan killed thousands of Americans so did Germany and China. USA has been humiliated pretty often by many other countries but USA has (correctly) not held the kind of grudge it has against Iran.
Iran-USA relationship seems complete irrational to me. It is as if the establishment in Washington and Tehran have some sort of gain from keeping things as bad as they are.