1) Regime change, which actually was facilitated in the prior administration, and to which that mission was accomplished + 2) The Iraqi Goverment believes they can protect themselves from enemies both foreign and domestic, and no longer needs our military assistance = "winning" in Iraq
On point one, I will concede that a regime change has, in its most bare definition, occurred. One wonders, though, if that regime change was effective.
On point two, I will not concede. The Iraqi government cannot protect itself from internal and neighbouring chaos, no matter how much they think they can. Not that I favour remaining for their benefit; I'm rather cruel in that regard. Let them fend for themselves. Sadly, we have worked ourselves into a desperate situation: the fallout of leaving can hurt the U.S. to a greater degree than the entire war already has. Quite a catch-22.