Brian Howey INDIANAPOLIS — One of the most vivid moments of my fatherhood was sitting in the woods one hot early July day on the Gettysburg battleground between Devil’s Den and Little Round Top, watching my two sons climb up what became the most important strategic heights of the American Civil War and a turning point for civilization. Had the Union lost at Gettysburg, the political will of the North to continue would have evaporated. There would have likely been a United States of America, the Confederate States of America, the Republic of Texas and, perhaps, a half dozen other nations. There would have been nations with slavery, regional wars and the accompanying Pandora's Box of atrocity and horror.