From visas to ESTA, how 9/11 transformed US travel requirements
Twenty-five years after the September 11, 2001 attacks, their legacy can still be seen in the travel requirements imposed on visitors to the United States. Tighter visa screening, biometrics, electronic passports and eventually ESTA: within just a few years, Washington fundamentally changed the way foreign travelers are screened before entering the country. And that process is still evolving today.
