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: Was secession constitutional? That was a major issue as the South departed in 1861. The Constitution, historical reality, and events in the next four years, proved that it was not. Whereas the states have retained a rich source of alternative initiatives, experimentation, governmental creativity and efficiency, at each stage of the nation’s development, when states have asserted their ability to abridge Federal power, Federal sovereignty prevailed.