That was a very frightening day. I was waiting for the other shoe to drop. We didn't know who had attacked us or what would happen next. Our government did their best to keep us safe and I don't feel we lost in any way.
Sorry, but that's my point. Americans had grown soft and complacent behind our large economy, large military and two oceans. Terrorism was a "Middle Eastern" or "European" thing. Tragedies like Munich or Achille Lauro happened and Americans typically tsked tsked and then went back to their happy, relatively carefree lives. We were ripe for being terrorized.
When we were attacked, as a nation, we had two primary choices; stand strong and give a collective "**** you!" or be terrorized. We allowed ourselves to be terrorized. Sure, our political leaders ordered the military to take down al-Qaeda, rightfully so, but Americans still hid in their homes and acquiesced to giving up essential liberties for the illusion of security. We lost that particular phase of battle. Since then, most Americans have become uneasy with the Patriot Act, torture and other excesses of government such as the war in Iraq. Would those things have happened if most Americans hadn't been successfully terrorized? I think they wouldn't have.