Now, more than ever.
Seriously, before the next terrorist attack-- which I believe our government's invasion of Iraq has made more likely, not less likely-- every American should watch this series, and get a little bit of perspective.
9/11 was a long long way from being the worst thing to ever happen here. In just one battle in the Civil War, twice as many people died in just twenty minutes. Not only that, but remembering the conflict between the North and South makes this whole red state vs. blue state seem a lot less frightening. The fact that the United States held a presidential election in the midst of Civil War should do much to answer those who believe that the "war on terror" requires sacrificing our democratic values.
As the very real threat that our nation faces continues, the example of what our ancestors overcame is the perfect remedy for the hysteria that our leaders have exploited. I'd hate to see what some future Ken Burns will make of us, a hundred and forty years hence.