The fault lines are much older than US entering Iraq and it is not Americans themselves to blame but the Shia prime minister Nouri Al-Maliki who actively marginalized Sunni, who were behind Americans after the reawakening. If there is one person to blame he is the one, Americans were able to at least put a workable coalition of Sunni-Shia and Kurds, which Al-Maliki actively sabotaged.
Americans are one party, it is the Iraqis and Syrians themselves who are responsible for much of the mess, and let us not begin with Qatar, Saudi, Kuwaiti funders and Iran and its proxies.
The nice simple narrative to bash the America is much more fun even though intellectually lazy.
Not excusing the fact that GWB is an ignorant moron and warmonger - but the Battle of Kadesh was in 1274 BC between the Hittites and the Egyptians. The Anatolian hornet nest has been swarming for over 3 millennia.
