This is Gary Gallagher speaking on remembering the Civil War, and specifically on the fact that the majority of Union soldiers were motivated by the desire to preserve the Union, something in the modern day we’ve seemed to have forgotten. This is an outstanding presentation, and the Q&A at the end is very good as well.
From the video’s description: “During the year the country marked the 150th anniversary of the start of the Civil War, historian Gary Gallagher spoke about the ways in which the war was currently remembered. He focused on the concept of the Union. He also responded to questions from members of the audience. This Miller Center Forum was held February 21, 2011.”