A.
Is the correct answer
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World War I killed more people (9 million combatants and 5 million civilians) and cost more money ($186 billion in direct costs and another $151 billion in indirect costs) than any previous war in history
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I believe it's camelot. Sorry if I'm wrong.
Prior to the outbreak of the Civil War, the election of 1860 increased sectional tensions of the United States by lifting pro-union, anti-slavery statesman, Abraham Lincoln into the Presidency. In reaction, the Southern States protested in many ways, but in no more dramatic way than, one by one, seceding.
