1) The South attacked the North first
First of all, I assume you are talking about Fort Sumter, which is the most obvious example.
When South Carolina seceded, South Carolina ordered all US troops out of its borders, of which the troops in Ft. Sumter were within. Both the commander of the fort, and the US government, refused to withdraw its troops, and further, President Buchanan ordered the resupply of Ft. Sumter.
After an ultimatum for withdrawal passed, South Carolina troops under PGT Beauregard fired on the fort, killing NO US troops, and forcing the surrender of Fort Sumter.
However, the aggression was on the part of the United States, by refusing to withdraw from South Carolina when ordered to do so, after the legal and proper secession of South Carolina. Further, ordering the resupply of the fort was another instance of aggression. In fact, these actions constituted valid acts of war, and thus South Carolina and a valid casus beli against the United States, a casus beli which was soon gained by all other states of the CSA upon the invasion of Virginia and the subsequent First Battle of Manassas (or Bull Run, to the Yankees).
Sorry to get off on a tangent, but what you said about the South attacking first was simply a case of history being rewritten by the victors, and had no basis in fact.
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