Newt Gingrich - Americans should learn more about Lincoln

[RJNorton]

"Without Lincoln, the Civil War would have likely ended with the South leaving the Union."

I think I have to disagree with Newt on this. (Maybe I am misunderstanding Newt - I am interpreting his words as Lincoln was the only President who would have reacted with force; maybe I am incorrect in this assumption regarding Newt's wording.) I think Andrew Jackson would have reacted with force in an effort to maintain the Union. Perhaps Polk, too?