The clue was in the date. A subtle effect of 9/11. The IRA got the same effect by bombing the Royal Exchange, London, (partly backed by US citizen contributions). Bomb people in Northern Ireland or the Middle East and most readers turn the page. Destroy a big building in a city and governments and citizens pay attention.
I can't see much effect for either World War, nor the American Civil War. There's an odd little bump in 1900. Perhaps to a first approximation it means nothing at all.
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