Question

Before the war began, how many Southern states seceded from the Union?

Answer 1

Hello there!
Its a great thing for me to help you today!
So, before the war began, ELEVEN southern states seceded from the Union.
Hopefully i helped today!
~Sammy) 

Answer 2

 Eleven states seceded from the Union before the "Civil War". They formed the Confederate States of America: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, North Carolina, and Tennessee.

I hope this helps. :)