British and Russians invaded Iran to secure the rail lines to distribute equipment to Russia to fight Germany... and toss out the Germans.
The Iranian army gave up soon, and the Shah was replaced. That "wound" never quite healed.
Subsequenly, there was hardship (lack of food/medicine) for Iranians that lead to death of up to 4 million people.
"The WWII occupation transformed Iranian political thought from a desire for reform into a demand for total upheaval. It convinced a generation of thinkers that the Western world was inherently predatory, leading to a revolutionary government that views international diplomacy through a lens of permanent suspicion and "sacred" resistance.

For a proud millenia peoples, that creates some resistance...
Note: I am not suggesting USA would be successful invading.
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