The real quick spark notes are:
Iran tried to socialize their Oil Production as they believed that Irani's deserved more than 10% of the profit generated instead of just paying Britain forever. In response the CIA did a coup d'état and there's been instability ever since.
Naturally the US aligned itself with it's own oil company in the region (California-Arabian Standard Oil, which is now the Aramco) given that it had just made an enemy of Iran. I think a pretty weird quirk of history is that if you squint hard enough Aramco is technically a Silicon Valley startup, with beginnings in San Francisco that was one of the largest IPOs of 2020.