Slightly off topic, but over the years working in the oil 'bidness' even in Alaska i've run into both Southerners and Texans (I think Texans are in a class by themselves). And have heard the argument, usually as an aside because it's not worth having and out-and-out about the (US) Civil War across regional lines. But two cute responses have come up.

The first is from my favorite engineer who grew up hardscrabble in Pennsylvania and does not suffer fools. When he heard folks try to call it "The War Between The States" his response was simply:

"Losers don't get to name the War!"

And for those who argue that the War was about States' Rights not Slavery, there is the original argument from President Abraham Lincoln, which I've read but don't remember word for word:

"You can't argue for a level of freedom for yourself when that is exactly what you are denying to a whole class of people under your power."

As usual, Lincoln understood it fully and expressed it best. If the United States is ever before a divine tribunal, it will be the words and actions of Lincoln that will represent the best in us.