Video: Civil War deadlier than thought

A new study by a demographic historian says the Civil War probably killed 20 percent more people than previously thought. NBC?s Brian Williams reports.

>>> grow up knowing the death toll in the civil war was just north of 600,000. 618,22 618,222, to be exact, but a new graph in hupstate new york said we need to change the history books because the number is north of that, close to $750,000, more than 20% more casualties than we thought and it was already the greatest death toll in all of war.

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