Twenty-five years after the deadliest foreign attack on U.S. soil, the vast national security apparatus built in response has made another 9/11-scale operation far harder to carry out. But the threat itself has changed shape, migrating from hijacked airliners and trained operatives to individuals radicalized online, small cells with little warning, and cyber and state-sponsored dangers capable of reaching deep inside the country.
Javed Ali had a front-row seat to that transformation. On the morning of Sept. 11, 2001, he drove past the Pentagon on his way to work in northern Virginia. Roughly half an hour later, American Airlines Flight 77 slammed into the building. From his office in Falls Church, he could see smoke rising. A year later, he was walking into the still-damaged Pentagon himself, now working in the Defense Intelligence Agency's counterterrorism office.
«It was a very eerie and odd and surreal moment in my career,» Ali told Fox News Digital. His path would eventually take him from the DIA to the newly created Department of Homeland Security and later the FBI, giving him a direct view of the architecture America constructed after the attacks that killed 2,977 people.
The scale of that response was extraordinary. Just over two months after the attacks, President George W. Bush signed legislation creating the Transportation Security Administration. TSA describes its creation as the largest civilian undertaking in U.S. government history at the time, with the federal government rapidly assuming responsibility for airport passenger and baggage screening. The following year, Congress created the Department of Homeland Security, combining all or part of 22 federal agencies and offices. DHS began operating in March 2003 and today employs more than 260,000 people across missions ranging from border and aviation security to cybersecurity, intelligence and emergency response.
The changes went beyond new agencies. The 9/11 Commission found that the pre-attack breakdown was deeper than the familiar failure to «connect the dots.» Responsibility had been scattered across agencies, information was not consistently shared, and no single entity was empowered to integrate intelligence and drive joint action across the foreign-domestic divide. The commission concluded that «responsibility and accountability were diffuse.» Washington spent the next two decades trying to close those gaps.
Brown University's Costs of War project estimates that post-9/11 wars and related obligations have cost roughly $8 trillion. It estimates that more than $1.1 trillion has been spent on homeland security efforts to prevent and counterterrorism inside the United States since DHS was created.
By one of its clearest measures, the system worked. The United States has not suffered another terrorist attack remotely approaching the scale and complexity of 9/11. U.S. intelligence and military operations dismantled much of the al Qaeda network that planned it, while new agencies, surveillance authorities, watchlists and intelligence-sharing systems were designed to ensure that another group could not exploit the same seams in American defenses. The 2026 U.S. intelligence community assessment said counterterrorism operations have degraded al Qaeda and ISIS's ability to quickly rebuild their leadership and plan large-scale attacks against the U.S. homeland.
But success against the threat of 2001 did not eliminate terrorism. It helped change it. Ali said it can be easy, with 25 years of hindsight, to forget how persistent the original threat remained. Even after the United States invaded Afghanistan, killed or captured senior al Qaeda figures and put the organization under extraordinary pressure, the group continued attempting to find ways back into the homeland. During Ali's years at DHS, officials repeatedly confronted plots involving al Qaeda and its affiliates, including a 2006 plot originating in Britain to bomb transatlantic airliners traveling to North America.
The threat then evolved again. Usama bin Laden was killed by U.S. forces in Pakistan in May 2011. But rather than marking the end of the era of jihadist terrorism, the following years produced a new and in some ways more difficult challenge. ISIS grew out of al Qaeda in Iraq, expanded rapidly amid the wars in Iraq and Syria and declared a self-described caliphate in June 2014. At its height, the group controlled vast territory and millions of people while encouraging or directing attacks far beyond its borders.
For U.S. counterterrorism officials, Ali said, the center of gravity increasingly shifted from identifying trained operatives sent by an organized group to finding individuals who might be radicalizing inside Western countries. Then came another shift: attacks by lone offenders across different ideologies, often with no direct operational relationship to an organization overseas.
Today's most difficult threats increasingly involve individuals radicalized online, small cells with little warning signature, foreign terrorist organizations seeking to inspire attacks from afar, and an expanding layer of cyber and state-sponsored threats capable of reaching deep inside the United States without hijacking an airplane. The question 25 years after 9/11, therefore, is not simply whether Americans are safer. They are safer from one kind of attack — while increasingly exposed to others.