If you lived in the South, it was referred to as the War of Northern Agression.
. . .which is why the “War Between the States” is probably the best nomenclature here on FR:
“The War of Northern Aggression” overlooks the fact that the CSA fired the first shots in an attempt to dislodge the Federal garrison at Fort Sumter.
“The Civil War” accepts the unitary-state abrogation of the Tenth Amendment that the Northern position entailed.
WBTS gives a nod to the correct position of the CSA on states rights, while not being so pro-Southern as to invoke the (false) accusation of being pro-slavery.