Here's the thing, the CIA almost failed and had to try again. It was unbelievably easy, all it would have taken is a handful of Iranians in power to do the right thing and report what was happening. Instead too many of them were corrupt. Further Mosaddegh was a very weird man and a target of the Soviets. If Britain and the US as their partners had not stepped-in, Iran very well could have fallen when the USSR's attention returned after Stalin's poor heath and death.

https://www.npr.org/2019/01/31/690363402/how-the-cia-overthr...