ISIS did not suddenly appear in 2014 like a villain stepping through a smoke machine. The organization grew from earlier jihadist networks in Iraq, especially al-Qaeda in Iraq and the Islamic State of Iraq. It then exploited war, political exclusion, broken institutions, corruption, prison networks, and a spectacular series of strategic misjudgments.

The rise of ISIS was not caused by one president, one government, one invasion, or one sectarian dispute. It was a chain reaction. Some links were forged in Washington, others in Baghdad, Damascus, regional capitals, militant organizations, and local power struggles.

The useful question is not, “Who gets all the blame?” History rarely hands out blame in neat little gift bags. The better question is, “Which decisions made an already dangerous movement much stronger?”

1. Invading Iraq Without a Credible Plan for the Day After

The 2003 invasion removed Saddam Hussein’s dictatorship, but military victory arrived much faster than a workable plan for public order, political legitimacy, essential services, and institutional continuity. Looting, insecurity, unemployment, and uncertainty spread while the occupation struggled to establish authority.

A state does not need to be admirable to perform basic functions. When policing, courts, salaries, utilities, and administrative systems collapse at the same time, armed groups begin offering their own brutal substitutes.

The resulting vacuum did not automatically create ISIS, but it gave insurgent organizations space to recruit, hide, intimidate civilians, collect money, and portray themselves as defenders of communities that felt threatened. Later U.S. Army and RAND assessments described how the invasion opened space for insurgency while institution-building proved considerably harder than the initial combat operation.

The fundamental mistake was treating the fall of a regime as though it were the same thing as building a stable political order. One can happen in weeks. The other can consume generations.

2. Disbanding the Iraqi Army

Coalition Provisional Authority Order No. 2 dissolved major Iraqi military and security institutions. The decision left large numbers of trained, armed, and angry men without salaries, status, or a defined place in the new Iraq.

Not every former soldier became an insurgent, of course. Many wanted nothing more than employment and stability. From an organizational perspective, however, the policy scattered exactly the kind of talent a rebellion wants: officers, intelligence specialists, logisticians, weapons experts, engineers, and people who understood the terrain.

Some former regime personnel later cooperated with jihadist groups for ideological, financial, tribal, or tactical reasons. ISIS benefited from a marriage of extremes: fanatical religious leadership combined with experienced Iraqi military professionals. It was less a romance than a hostile corporate merger, but it created a frighteningly capable machine.

RAND research found that disbanding the army and implementing sweeping de-Baathification measures triggered unrest and weakened local security structures, including those in Mosul.

3. Turning De-Baathification Into Collective Exclusion

Removing senior officials responsible for dictatorship and repression was necessary. Applying de-Baathification too broadly was something else entirely.

Many Iraqis had joined the Baath Party because membership was usefulor practically requiredfor careers in education, administration, engineering, medicine, and public service. Sweeping exclusions hollowed out ministries and convinced many Sunni Arabs that the new political order viewed them not as citizens to be integrated, but as a population to be punished.

That perception became a recruiting asset for insurgents. ISIS could point to lost jobs, blocked careers, politicized prosecutions, and unequal treatment as evidence that peaceful political participation was pointless. The organization’s answer was monstrous, but some of the grievances it exploited were real.

RAND later connected continuing de-Baathification, imprisonment, and the violent treatment of Sunni protesters to the drift of some members of affected communities toward ISIS.

A policy designed to remove a dictatorship’s leadership had evolved into a mechanism that excluded too many of the people needed to build a functioning replacement.

4. Creating Detention Systems That Connected Future Extremists

Detention was necessary during a violent insurgency, but mass detention created major screening and networking problems. Facilities such as Camp Bucca held hardened jihadists, former military personnel, opportunists, suspected insurgents, and people detained on weak or mistaken grounds.

Popular accounts sometimes exaggerate by calling these prisons a simple “ISIS university,” as though one detention facility assembled the organization from scratch. Reality was considerably messier.

Still, detention allowed some extremists to meet, assess one another, exchange contacts, and build trust under conditions that rewarded clandestine organization. Future ISIS leaders passed through U.S. or Iraqi custody, while authorities sometimes lacked the evidence, intelligence, or legal capacity required to identify the long-term danger they posed.

West Point’s Combating Terrorism Center has documented the detention and later release of people who rose within the Islamic State, while also warning that available records do not support every popular myth about prison radicalization.

The lesson is not that dangerous detainees should never be released. It is that detention policy must be treated as a strategic system, not merely a warehouse with fences.

5. Treating the Earlier Defeat of Al-Qaeda in Iraq as Permanent

Between roughly 2008 and 2011, al-Qaeda in Iraq and its successor, the Islamic State of Iraq, were badly weakened. U.S. military pressure, Iraqi operations, intelligence penetration, and the Sunni tribal Awakening stripped the organization of territory, leaders, and local support.

The mistake was confusing severe damage with extinction.

Insurgent organizations often survive by shrinking, hiding, preserving money, intimidating informants, and waiting for political conditions to improve. Islamic State operatives systematically assassinated tribal leaders, community figures, and others who cooperated with the Iraqi government. These killings weakened the networks that might otherwise have resisted the group’s return.

Analysts later concluded that optimism about the organization’s defeat had been premature. The weeds had been cut very short, but the roots were still enjoying the garden.

The reduction in violence encouraged political leaders to believe the threat had become manageable just as the underlying political conditions began deteriorating again.

6. Failing to Secure the Sunni Awakening’s Political Future

The Sunni Awakening, also known as the Sahwa or the Sons of Iraq movement, was one of the most important reasons al-Qaeda’s Iraqi branch lost ground. Tribal fighters turned against jihadists whose brutality, coercion, and interference in local life had become intolerable.

Yet the political bargain behind that military success was never fully protected.

Many Awakening members expected regular salaries, integration into the security forces, protection from retaliation, political representation, and a meaningful place in the Iraqi state. Baghdad often delayed, limited, or politicized that integration.

As trust eroded, some communities became less willing to risk their lives against returning militants. ISIS did not need every Sunni resident to support it. It merely needed enough people to remain neutral, frightened, resentful, or doubtful that the government would protect them.

CSIS analysis later highlighted unfulfilled promises involving jobs and promotions for the Sons of Iraq as part of a wider failure of governance and national inclusion.

Local allies had helped defeat the insurgency once. Failing to honor the political side of that partnership made it much harder to mobilize them when the insurgency returned.

7. Enabling Sectarian and Authoritarian Governance in Baghdad

Under Prime Minister Nouri al-Maliki, political power became increasingly centralized, security institutions were politicized, and prominent Sunni politicians and communities faced exclusion and coercion.

Iraq’s problems were structural and cannot be reduced to one man. Nevertheless, Maliki’s governing style deepened distrust at precisely the wrong moment.

Sunni protests beginning in 2012 raised demands involving detainees, political representation, anti-terrorism laws, and de-Baathification. Heavy-handed responses, including the deadly 2013 raid at Hawija and the clearing of a protest camp near Ramadi, helped militants argue that peaceful negotiation had failed.

Carnegie Endowment analysis identified Maliki’s alienation of Sunni political and tribal actors as central to ISIS’s success. It also emphasized that the uprising of 2014 initially involved a broader collection of Sunni insurgents, former regime figures, tribal forces, and local groupsnot ISIS alone.

ISIS eventually dominated or destroyed many of those temporary partners. Yet their early cooperation helped the organization enter places where it might otherwise have faced immediate local resistance.

8. Letting Syria Become an Extremist Sanctuary

The Syrian uprising began in 2011 with protests against Bashar al-Assad’s rule. The regime’s violent repression helped transform unrest into armed conflict. As the war fragmented, territory slipped beyond effective state control, opposition groups competed for weapons and legitimacy, foreign governments backed different clients, and civilians endured siege, torture, displacement, and bombardment.

ISIS exploited this chaos masterfully. Syria offered territory, oil fields, weapons, recruits, smuggling routes, prisons, and a dramatic narrative of apocalyptic war.

The Assad regime frequently concentrated its military pressure on other opposition forces, while the non-jihadist opposition remained divided and inconsistently supported. Moderate groups were trapped between regime forces, extremist organizations, local rivalries, and competing foreign sponsors.

By 2013, the Islamic State of Iraq could expand across the border and rename itself the Islamic State of Iraq and Syria. Brookings observed that the organization benefited from a fractured Syrian opposition and from the regime’s focus on more moderate rivals.

Policymakers often treated Iraq and Syria as separate crises. ISIS treated them as one battlefieldand erased the border whenever doing so was convenient.

9. Building Iraqi Security Forces That Looked Stronger on Paper

The United States spent heavily to train and equip Iraqi security forces, but uniforms, equipment, and impressive personnel figures did not guarantee cohesion.

Corruption produced “ghost soldiers” who appeared on payrolls but not necessarily in formations. Political interference distorted command appointments. Units were drawn into sectarian disputes, logistics remained unreliable, and many soldiers doubted the leaders and institutions they were being asked to defend.

When ISIS attacked Mosul in June 2014, parts of the Iraqi security apparatus collapsed with shocking speed, abandoning weapons, vehicles, territory, and civilians.

The fall was not proof that ISIS possessed an unbeatable army. It showed that a smaller force with initiative, local networks, and psychological momentum could shatter a larger institution whose confidence had already been eaten from the inside.

CSIS connected the Mosul collapse to corruption, political repression, weak governance, poor leadership, and the failure to build an inclusive national security system.

ISIS then captured American-supplied vehicles and weapons, transforming the Iraqi army’s failure into the extremist group’s next recruitment commercial.

10. Responding Too Slowly to ISIS as a State-Building and Media Project

ISIS was more than a conventional terrorist cell. It seized cities, administered courts, operated prisons, issued documents, collected taxes, controlled infrastructure, sold oil, extorted businesses, looted assets, kidnapped people for ransom, and converted captured military equipment into offensive power.

It also created polished propaganda for several audiences at once: foreign recruits, local residents, enemies, potential donors, and thrill-seeking online spectators. Its media teams made battlefield advances appear unstoppable while hiding military losses and the miserable reality of life under its rule.

Governments initially struggled to respond to this hybrid threat. Counterterrorism agencies were accustomed to hunting clandestine networks. Armies were accustomed to fighting armies. Financial authorities focused heavily on international transfers. ISIS combined insurgency, terrorism, organized crime, territorial government, and digital marketing.

U.S. Treasury officials later identified robbery, extortion, oil sales, ransom payments, seized bank assets, and external donations as major sources of revenue. Treasury estimated that ISIS collected approximately $500 million from oil sales during its period of territorial power.

By the time a broad international campaign began systematically attacking the organization’s oil infrastructure, financial intermediaries, leadership, and territorial control, ISIS had already used its wealth and publicity to build a global brand.

What These Mistakes Reveal

The rise of ISIS was not inevitable. The organization possessed its own ideology, leadership, discipline, brutality, and strategic intelligence. Its members made deliberate choices and committed mass murder, enslavement, persecution, torture, and cultural destruction.

Yet its success required more than fanaticism. It required political vacuums, frightened communities, collapsing institutions, unguarded borders, corrupt security forces, illicit income, and leaders who repeatedly chose short-term political advantage over inclusive government.

The central lesson is uncomfortable because it is not cinematic. Defeating extremist organizations is not only about killing commanders or bombing positions. It is also about preventing governments from manufacturing recruits through abuse, ensuring that local allies are not discarded after they become inconvenient, maintaining competent institutions, cutting illicit revenue early, and treating political legitimacy as a security asset rather than decorative paperwork.

Experience-Based Lessons From Iraq and Syria

The practical experience of confronting ISIS offers lessons that extend far beyond one organization or one region.

Local Knowledge Is Operational Infrastructure

Tribal leaders, municipal officials, journalists, aid workers, religious figures, business owners, and ordinary residents often recognize growing social pressure long before it appears in an intelligence dashboard.

In Iraq, local communities could distinguish committed ISIS members from smugglers, coerced recruits, opportunists, and frightened neighbors. When governments treated entire districts as suspect, they alienated the very people capable of providing precise information.

Security forces cannot buy community trust during an emergency as though ordering spare equipment. It must be accumulated through fair treatment, reliable protection, and years of ordinary interaction.

Promises Made During Emergencies Must Survive Them

The Awakening experience demonstrated that local partners will accept enormous risks when they believe a durable political bargain exists. A handshake offered during a firefight, however, is not enough.

Salaries, legal status, protection, representation, and dispute-resolution mechanisms must follow. Otherwise, former partners conclude that cooperation is a one-way transaction: they provide blood while distant officials provide speeches.

Once that conclusion takes hold, persuading the same communities to mobilize again becomes considerably harder.

Military Liberation Is Only the Beginning

Residents returning to Mosul, Ramadi, Raqqa, and smaller towns needed explosives cleared, schools reopened, electricity restored, identity documents replaced, property disputes resolved, and trustworthy courts and police established.

Where reconstruction was slow or collective punishment prevailed, ISIS remnants could revive intimidation, assassination, and extortion. A neighborhood with no services, no employment, and no trusted police station is not fully liberated. It is merely between rulers.

Stabilization is less exciting than a battlefield victory, which is precisely why it is often neglected. Unfortunately, insurgents are perfectly willing to attend the meetings everyone else skipped.

Detention Policy Must Be Part of Battlefield Strategy

Authorities need lawful screening, reliable evidence, humane conditions, rehabilitation programs where appropriate, and ways to separate influential extremists from vulnerable detainees.

Arbitrary or indefinite detention can turn individual cases into family and community grievances. Careless releases, meanwhile, can return experienced organizers to clandestine networks.

The balance is difficult, but ignoring it simply hands the problem to the future with interest.

Credible Communication Requires Visible Competence

ISIS understood that perception could produce battlefield effects. Videos of victories encouraged recruits, frightened defenders, exaggerated momentum, and made local collapse appear inevitable.

Governments frequently answered with slow press releases written in the emotional register of a printer manual. Effective counter-messaging cannot depend on slogans alone. It must be supported by protected civilians, functioning courts, paid police officers, honest casualty reporting, reliable public services, and credible local voices.

A propaganda claim is much easier to defeat when residents can compare it with a government that works.

Prevention Costs Less Than Rebuilding a Shattered State

Inclusive politics can be frustrating, slow, and full of people who make meetings feel longer than human civilization. It is still cheaper than civil war.

Professional local security forces may look less dramatic than elite strike teams, but they are more useful at three in the morning when a frightened resident needs someone trustworthy to answer the telephone.

The deepest lesson of ISIS’s rise is that political order must be maintained every day. When institutions fail for years, extremists do not need to create every grievance. They only need to weaponize the pile already waiting for them.

Conclusion

ISIS rose because a determined extremist organization encountered a landscape repeatedly reshaped in its favor. The invasion of Iraq, inadequate postwar planning, army dissolution, overbroad de-Baathification, flawed detention practices, abandoned tribal partnerships, sectarian governance, Syria’s catastrophic war, hollow security institutions, and delayed action against terrorist financing and propaganda all contributed to that landscape.

None of these mistakes made ISIS unavoidable, and none reduces the organization’s responsibility for its crimes. They do demonstrate why counterterrorism cannot be separated from governance.

A government that protects rights, provides services, includes communities, and disciplines its security forces removes oxygen from extremist recruitment. A government that humiliates citizens, rewards corruption, and breaks agreements may win a tactical battle while quietly preparing the next war.