Americans are marking the 25th anniversary of the 9/11 attacks, a solemn occasion to remember the almost 3,000 people who died when al-Qaeda extremists hijacked four commercial jets. These planes crashed into the World Trade Center in New York, the Pentagon, and a field in Pennsylvania. The anniversary involves memorial rituals such as wreath-laying, moments of silence, and the reading of victims' names, with about half of U.S. adults considering it the most historic event of their lifetime. This year, the New York ceremony will include a moment of silence for those who have died from 9/11-related illnesses due to toxic dust exposure.

The attacks led to significant changes in U.S. air travel, the creation of the Department of Homeland Security, and new federal surveillance powers and banking regulations. They also prompted the U.S.-led global war on terrorism, including invasions of Iraq and Afghanistan. While al-Qaeda leader Osama bin Laden was killed in 2011, alleged 9/11 mastermind Khalid Sheikh Mohammed still awaits trial, with a date now set for June 2028 at Guantanamo Bay. This long delay has caused distress among victims' families, some of whom fear they may not live to see justice.

Beyond the immediate casualties, more than 9,400 people have since died from 9/11-related illnesses, highlighting the long-term health consequences of the attacks. The anniversary serves as a National Day of Service and Remembrance, encouraging volunteerism. Efforts are also underway to educate younger generations who did not experience the event firsthand, with organizations like the 9/11 Memorial & Museum focusing on outreach and personal testimonies to preserve its memory and significance.