Eleven
Eleven States withdrew from the Union and became the Confederate States of America. Three states remained neutral, which were also on the border between North and South.
11
11 states
11
Eleven
11 states were on the Confederate side 20 states were on the Union side There were 5 border states, including West Virginia
about 20 more
I can only think of one and that was Woodrow Wilson.Several other presidents went to school in states that were future Confederate state or had been confederate states when they lived there.
14
about 20 more
about 20 more
Eleven