A quarter of a century after hijacked planes struck New York, Washington and Pennsylvania, the attacks of 11 September 2001 remain lodged in the American psyche more firmly than almost any other event of the past 25 years.
A new Ipsos poll finds that roughly half of US adults, unprompted, name 9/11 among the most significant events of their lifetime — ahead of the Covid-19 pandemic, the elections of Barack Obama and Donald Trump, and Hurricane Katrina of 2005.
Nine in ten say the attacks changed the country "a great deal" or "quite a bit," and most Americans can still recall exactly where they were when they heard the news.
Yet despite that lasting wound, only around one in ten plan to actively mark Friday's anniversary - for those that do a moment of silence and the flying of the flag are the most common gestures.
Confidence in the government's ability to prevent another attack has also declined steadily since the record highs recorded in the days after 2001.
