Yes USA can nuke Iran.
And North Korea, China and Russia could also nuke every ally to USA in Europa , the ME and Asia. Probably Australia too.
Leaving USA Russia China and North Korea standing.
Now who think that USA Alone would be able to defeat them?
How about a Russian submarine hidden in the Gulf of America suddenly nuking Washington?
I wonder if even Putin knows the exact whereabouts of all their Submarines.
That said, they did scrap most of them.
Even though I was about 8-10 years younger than the Arnold family, lots of the stuff they covered in this series hit home with my school years in the late 70’s/early 80’s
This was worth reading.
https://joehoft.com/analysis-reason-democrats-only-democrats-side-iran/