Lead: One hundred and fifty years ago the Republic was facing its greatest crisis. This continuing series examines the American Civil War. It is "A House Divided."

Intro: A Moment in Time with Dan Roberts.

Content: When the surging Republicans assembled in the especially built Chicago convention building nicknamed the “wigwam” in May 1860 there were four viable candidates and a dark horse. The party faced a serious problem. Locked out of the south and probably the border states they had to win nearly every free state to achieve the necessary electoral majority.