But this has gradually been going on over the last ten years or so.
I have a very good friend who is Iranian, a woman engineer who I supervised several years ago. One day I walked into her office and saw that she was listening intently to the Farsi-language radio station here in Houston, as the announcer in an obviously excited tone rattled on nonstop. She told me that it was a call-in show, and they were discussing changes that were coming about in Iran. Most of the callers were declaring their intention to go to Iran as soon as "counter-revolutionary leaders" gave the call.
My friend, who is a well-to-do middle-aged mother of three, about five foot nothing and 100 lbs., said to me, very seriously "I'm going to go to Academy and buy a camo outfit, and we're buying weapons now, as many as we can get, and we're going over there and take back our country!"
Of course nothing has really happened along those lines since then, but it is hard for us to understand how the Iranian diaspora feels about things. They could form the first wave of a pretty potent force.
FWIW, my friend's father, and her husband's father, were both high-ranked generals in the Iranian air force and army respectively. They lost everything when Khomeini took power. Their children of course are thoroughly American, and she has no illusions about their wanting to go back to the "home" they have never known. But I can put myself in her place and know how I'd feel.