If you are referring to World War II, Australia, Canada, New Zealand, South Africa and the United States suffered the fewest civilian casualties because they are all so far from the main area of the fighting and in general were spared the bombing of civilians by enemy aircraft.
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The American Civil War was the deadliest war. That is because every death on either side was an American
1861, the un-declared US Civil War, officially called the "War of the Rebellion", and also known as the "War between the states."
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the civil warAnother Answer:The deadliest battle on US Soil was Gettysburg. Other battles had more casualties or made more men unfit to fight, but Gettysburg put more in the grave.
Battle of the Argonne Forest