I have on my calendar a repeating reminder for a moment of silence, marking the time when the Twin Towers fell (yes, I know they fell a half hour apart). I remember the events of the day as if they were yesterday. I can't even look at the images without the same anger welling up in me.

But I also remember how we, the collective "we" of the US of A, came together after the attack.

And I see how divided we've become, in just 16 short years, and I wonder... What happened?