t another civil war, socially and culturally, how could this happen? How could it come to this? What's more, what do we do about it? Abraham Lincoln stood among the graves of those who had given their lives at Gettysburg imploring and warning that we must never forget what they did there. Why Gettysburg? What was it that was done there that we should remember? There's more to Gettysburg than a battle of the Civil War. Understand Gettysburg, and we'll understand why we can never forget. Understand Gettysburg, and we'll know what to do here and now.