From the article Iraq blowback: Isis rise manufactured by insatiable oil addiction
In the run up to the 2003 invasion, oil was again centre stage. While the plans to invade, capture and revitalise Iraq's flagging oil industry with a view to open it up to foreign investors were explored meticulously by the Pentagon, US State Department and UK Foreign Office – there was little or no planning for humanitarian or social reconstruction.The Islamic group, ISIS, another Pentegon creation. According to the article above, "the Bush and Obama administration have - through Saudi Arabia, Qatar and other Gulf states - fostered extremist Sunni groups affiliated to al-Qaida across the Middle East to counter Iranian influence. That has included extensive financing of jihadist groups in Syria to the tune of up to a billion dollars – a policy that began as early as 2009, and continued in the context of pipeline geopolitics. The US and UK had apparently decided that a proposed Iran-Iraq-Syria pipeline would undermine the interests of their favoured friends – Saudi Arabia, Qatar, Turkey and Jordan."
Opening up Iraq's huge oil reserves would avert what one British diplomat at the Coalition Provisional Authority characterised as a potential "world shortage" of oil supply, stabilising global prices, and thereby holding off an energy crunch anticipated in 2001 by a study group commissioned by vice president Dick Cheney.
.... Simultaneously, influential neoconservative US officials saw an opportunity here to pursue hair-brained ambitions to re-engineer the region through the de facto ethno-sectarian partition of Iraq into three autonomous cantons: a vision that could not be achieved without considerable covert violence.
According to US private intelligence firm Stratfor, Cheney and deputy defense secretary Paul Wolfowitz co-authored the scheme, under which the central and largest part of Iraq populated mostly by Sunnis (including Baghdad) would join with Jordan; the Kurdish region of northern and northwestern Iraq, including Mosul and the vast Kirkuk oilfields, would become its own autonomous state; and the Shi'a region in southwestern Iraq, including Basra, would make up the third canton, or would join with Kuwait.
Stratfor warned presciently that: "The new government's attempts to establish control over all of Iraq may well lead to a civil war between Sunni, Shia and Kurdish ethnic groups… The fiercest fighting could be expected for control over the oil facilities" – exactly the scenario unfolding now. Fracturing the country along sectarian lines, however, "may give Washington several strategic advantages":
"After eliminating Iraq as a sovereign state, there would be no fear that one day an anti-American government would come to power in Baghdad, as the capital would be in Amman [Jordan]. Current and potential US geopolitical foes Iran, Saudi Arabia and Syria would be isolated from each other, with big chunks of land between them under control of the pro-US forces.
Equally important, Washington would be able to justify its long-term and heavy military presence in the region as necessary for the defense of a young new state asking for US protection - and to secure the stability of oil markets and supplies. That in turn would help the United States gain direct control of Iraqi oil and replace Saudi oil in case of conflict with Riyadh."
The Stratfor report noted that the plan was only one among several under consideration at the time, and not yet finalised.