Democracy as we know today is actually pretty novel and
modern concept in the history of civilization.
Someone has to redefine the meaning of invasion warfare to distinguish
wars waged by democracy from those fought by totalitarian states as
interpreted by history. Until such definition is known and accepted
a war such as Bush's regime-change war would be understood
as the invasion of Iraq by the U.S.
Make no mistake about it, the U.S. has invaded Iran. The
war of invasion is fought in the sky so far but we still call
the aliens invaders even if their flying saucers are destroyed
before landing.
The difference between democracy (and yes, the USA is a democracy) and a totalitarian state is that, in a democracy, the government is supported by a significant part of the population and actually cares about being elected and has a chance to lose if the vast majority does not support it. So, you can say that USA attacks Iran, but you cannot say that Palestine attacks Israel or Russia attacks Ukraine. And no, you cannot say that Israel attacks Palestine, it attacks Hamas. The same distinction applies to the "USA Government" vs. "Iran regime". You cannot equate democratic and totalitarian countries.