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: The American crisis of 1860-1861 brought into bold relief one of the most important constitutional questions left unresolved by the Founders: just what were the parameters of Federal and State sovereignty? Where did the powers of the new Union begin and end and did a State, having committed itself to the united Republic, have the right resist the power of the Federal government and ultimately separate itself in an act of secession? In other words, was secession constitutional?