There have been no 9-11-caliber attacks since September 11, 2001. Some say it’s a testament to better security at landmark buildings, ports, military installations. Others attribute the stateside peace as a matter of luck. Still vulnerabilities remain, and so does the debate over the country’s level of safety. Cybersecurity leadership in the government has been subject to quite a bit of turnover. Privately-owned critical infrastructure companies and groups have taken some steps, creating security programs and leadership positions.”]
Source: https://www.csoonline.com/article/2124348/eight-years-after-9-11–better-security-or-just-luck-.html