The War for Southern Independence.
I think the War of Southern Rebellion is more accurate but that's just me.
The War for Slavers' States Rights.
the OlLine Rebel: "If they wanted to leave, let them leave.
Why “union” at the point of a gun?"
In his 1861 First Inaugural, Pres. Lincoln offered Confederates, in effect, "peaceful coexistence".
Confederates refused, started war on April 12 and then formally declared war on May 6, 1861.
That's why.
eyedigress: "The South wanted out."
Not "the South", only the ruling slavocracy in seven cotton states.
FLT-bird: "I think war for Southern Independence more fitting.
After all, they were simply leaving an oppressive regime just like their fathers and grandfathers had done."
That's a total lie!
The allegedly "oppressive regime" was actually Southern Democrat rule over Washington, DC, from the election of 1800 until secession in 1861.
What Southern Democrats then could not tolerate was future prospects of having to live under the "oppression" they themselves had imposed for the past 60 years!
In 1860 Democrats went as berserk from the election of Republican Lincoln as they have since 2016's election of Republican Trump.
It was just Democrats doing what Democrats by their natures do.