My guess is we could...but not with weak leftists and defeatists in charge.
And just how our presence maintained a balance of power in the far east, so would it have done the same with Iran and Syria...but the girly men erroneously think diplomacy will achieve the same result...and now we are seeing the fruits of that weak policy.
Perhaps we could if we were willing to kill 90% of their population and accept casualties of our own in the tens of thousands and borrow several trillion more dollars to do it. Short of that, no, it could not be done it will not be done and only a mad man would do it.