Only America could lose back to back wars in both of Iran’s neighbors and think they are invincible.
A land war against Iran would likely go like worse than Afghanistan, Iran has a trained paramilitary that is at a minimum 3 or 4 times the size the Taliban was at the peak of the war in Afghanistan, plus they have likely been trained based on the success of the Afghanistan.
Not only that, but only the most corrupt officials are going to be willing to run the puppet state, given it’s just a matter of time until the regime collapses and is replacing by something worse (and all it’s public figures are forced to flee or die).
Like sure the US could technically win a war, but by any reasonable definition the war won’t end until they leave in defeat.
Well stop being allies then!