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An exact count of soldiers who died in combat and from disease during the Civil War is impossible, historians say. Prof Hacker estimates between 650,000 - 850,000 deaths, but believes the most likely number was about 750,000. That is equivalent to 7.5 million US dead in 2012 numbers.
The number of soldiers who died between 1861 and 1865, generally estimated at 620,000, is approximately equal to the total of American fatalities in the Revolutionary War, the War of 1812, the Mexican War, the Spanish American War, World War I, World War II, and the Korean War, combined.