The Civil War -- already considered the deadliest conflict in American history -- in fact took a toll far more severe than previously estimated. That's what a new analysis of census data by Binghamton University historian J. David Hacker reveals.

Hacker says the war's dead numbered about 750,000, an estimate that's 20 percent higher than the commonly cited figure of 620,000. His findings will be published in December in the journal Civil War History.

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