This is a US passport. Born in Iran, moved there as a child is my bet. Probably from a wealthy family, usually Iranians don’t get to move to the US unless they’re wealthy. Unless you won a green card lottery or something.
What's funny about this is Americans love to claim they are "X nationality" while they are like 5 generations down living in America and have never left their home town. Not saying OP is, they could very well have moved here very young, but as an American it reads just like that and those folks always make me facepalm in secondhand embarrassment lol.
Yep, it is like that, and for all we know, it’s grandpa’s passport. Again, I can’t be sure on that, but I am sure that they identify as American, except for this one moment where it was convenient for them to identify as Iranian.