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OK not technically Sept 11th, but on Sept 6th 1901, recently relected President MicKinnely was minding his own business while visiting the Temple of Music at the Buffalo World Fair when an anarchist ran up and shot him. A few days later he died and Teddy was president. The world's fair carried on.
But..
What if the anarchist attack was much much bigger and deadlier?
Say, in addition to a single assassin's bullet, dynamite or explosives were used on attractions like the Electric Tower, New York State Building etc., basically resulting in the same loss of life (or greater) then the more recent Sept 11th tragedy. (3000+)
How would this effect turn of the century America?
Would there be a "War on Anarchism"? with a coalition of the willing?