http://Mises.org
The late great Murray Rothbard gave a series of lectures in 1986 at New York Polytechnic University entitled "The American Economy and the End of Laissez-Faire: 1870 to World War II." Fortunately for us, they were recorded by Hans Hermann-Hoppe.
This opening lecture is entitled "The Civil War and Its Legacy."
Audio for the entire lecture series can be found here:
http://mises.org/media.aspx?action=category&ID=217
