Arango takes a look back at the history of Iraq- the 400 years of Ottoman rule and the role of Gertrude Bell in defining Iraq's current borders under British rule. Saddam Hussein, Maliki and Islamic State pitted Sunnis against Shiites and Sunnis against Kurds for the last 40 years, leavig a divided country. The current effort to put Iraq together as a country with different faiths and communities under prime minister Abadi will take many years after so much bloodshed. Northern Ireland shows that it can be done after much pain and loss, when all realize putting the past behind is the only way forward.