As Wiliqueen noted: On July 22, 1916, in the run-up to the US entering the First World War, San Francisco, California, so far from the fighting in Europe, held a "Preparedness Day" parade. It remains unknown to this day who planted the bomb that killed 10 and injured 40 during that parade.
Wikipedia says that the Preparedness Day bombing is still the worst terrorist attack in San Francisco's history. May it ever stay the worst. May no worse ever again happen anywhere.
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