re: How has the United States avoided another 9/11?

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I guess I meant a large-scale attack of any kind. Like the Boston marathon bombing but times 10. Or a packed stadium. Public transportation. Etc.

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I think my last point is the main reason here.

Also, major events always have a show of force behind them.

I can't think of the last football game that I couldn't find a least one SWAT sniper on overwatch.

Also, increased tech leveraging freedoms given by the Patriot Act.

Ever see those police canopy's but it has a camera on top? Ever notice they typically have double binocular format? That is to generate a digital stereoscopic image to facilitate facial recognition. That camera can sweep the crowd and compare it to a database of persons of interest quite easily.