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3. What's changed in 20 years
Two decades later, we don't have to look hard to find changes in our lives that happened because of 9/11, from air travel headaches to fear-driven politics that still disrupts many Americans' lives.
- Here we've identified the biggest changes that had a lasting impact — or foreshadowed broader social dilemmas we're grappling with today, like the vulnerabilities of the internet and our attitudes toward privacy.