Well, for example, 15 years ago there were efforts at diversification of products, we were developing nuclear energy, and wealth disparity was surprisingly good (as in, low) for a country like Iran (so lower than Scandinavia of course but not like Saudi Arabia).
Recent years have seen us become more and more dependent on selling oil, which would have been what the US wanted of us, to be a cheap source for resources, and many Iranians escape the harsh reality here, essentially providing the US and Europe with cheap labor, which is again what the US would have wanted if they had more control…