A study suggests a previously widely accepted death toll of the US Civil War may actually be way under the mark. How many did perish in this conflict, fought before the era of modern record-keeping and DNA identification?

Now, it appears a long-held estimate of the war's death toll could have undercounted the dead by as many as 130,000. That is 21% of the earlier estimate - and more than twice the total US dead in Vietnam.

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