alternatehistory.com

To review, this means a war taking place in western Europe (other fronts are optional, but this can't be purely a Balkan-Black Sea thing) taking place between 1818 and 1900, matching or exceeding the American Civil War figures of 625,000–850,000 war dead and lasting at least as long as the ACW's 4 years, 3 weeks and 6 days.
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