求美国南北战争的意义,要英文的,大概200字左右

The American Civil War was one of the earliest true industrial wars. Railroads, the telegraph, steamships, and mass-produced weapons were employed extensively. The mobilization of civilian factories, mines, shipyards, banks, transportation and food supplies all foreshadowed World War I. It remains the deadliest war in American history, resulting in the deaths of an estimated 750,000 soldiers and an undetermined number of civilian casualties. Historian John Huddleston estimates the death toll at ten percent of all Northern males 20–45 years old, and 30 percent of all Southern white males aged 18–40.
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