It's interesting to me that another historic parallel has popped up with this terrorist incident in Paris at Charlie Hebdo magazine.
The American Revolution began in 1776 and the French Revolution in 1789. Separated by 13 years, these two events led to massive changes in their countries, on their continents, and even throughout the world.
9/11 happened in 2001, and Charlie Hebdo in 2015. That's a separation of 14 years, close enough to count. 9/11 changed America, and continues to do so. Charlie Hebdo is changing France and Europe. We're onto something here, something massive, and world-altering, and it's moving into 2nd gear.
Of course, after the French Revolution came the Terror, then Napoleon, then 70 years of on-again off-again conflict between the monarchy (always trying to restore itself) and the various Republics. Finally, by the time of our American Civil War, France had the Third Republic, and a stable democratic society.
Don't know what this portends for us all, given that another historic parallel in our "clash of civilizations" conflict with Islam and the Middle East is also happening at the same time. I'm thinking here of the Crusades and the issues surrounding Jerusalem.