@WilliamNB
I think you might have your facts mixed up. The US was involved in a coup to remove the democratically elected prime minister at which point the shah was installed into power. And yes, it involved oil and who controlled it.
https://en.wikipedia.org/wiki/1953_Iranian_coup_d%27%C3%A9tat#:~:text=The%201953%20Iranian%20coup%20d,Mohammad%20Reza%20Pahlavi%2C%20on%2019