When Saddam was hung in Baghdad on December 30, 2007, then president George W Bush already knew that the invasion of Iraq, which had already left 3,000 US forces dead, had not yielded the progress Washington sought.
"Many difficult choices and further sacrifices lie ahead. Yet the safety and security of the American people require that we not relent in ensuring that Iraq's young democracy continues to progress," Bush said at the time.
The Sunni minority that once ruled Iraq grew increasingly resentful toward a predominantly Shiite government -- a resentment that helped fuel the rise of the ultra-radical Islamic State group that counts former Saddam military officials in its ranks.
More than 5,000 US soldiers are still on the ground providing critical support to an Iraqi army still unable to alone man a war against the violent extremist fighters.
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The American public, which once gave strong support to the 2003 US-led invasion, is still recovering from the trauma of war.
Meanwhile, Obama's successor Donald Trump built his presidential campaign in part on pledges that the United States would never again engage in "regime change" or "nation building."
Trump also said repeatedly that unlike his opponent Democrat Hillary Clinton, he was against the war in Iraq -- despite telling radio personality Howard Stern in a 2002 interview that he would support an invasion.
More than a decade later, some American policy-makers are still trying to understand the reasons for the failure.
Far from being an all-powerful dictator, Saddam during his last years in power "seemed clueless about what had been happening inside Iraq," Nixon wrote in a recent newspaper column ahead of the Thursday release of "Debriefing the President: The Interrogation of Saddam Hussein."
"He was inattentive to what his government was doing, had no real plan for the defense of Iraq and could not comprehend the immensity of the approaching storm," Nixon said.
But top US officials firmly believed that toppling Saddam's Baathist regime would lead to peace in Iraq, Nixon said.
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