Simon Schama ) continues his travels through America, against the backdrop of the presidential campaign, to dig deep into the conflicts of its history to understand what is at stake right now.
In the second episode, American War, Schama reveals how different the American attitude to war is from what outsiders assume it to be. "The world has got in the habit of thinking of America as the tough-guy empire; trigger-happy cowboys addicted to the rush of military power. But that's not the way America sees itself," he says.
Two of the founding fathers, Thomas Jefferson and Alexander Hamilton, disagreed about whether America should even have a professional army - a division still evident when Schama visits America's premier military academy at West Point. From the Civil War right through to Mark Twain's denunciation of President Teddy Roosevelt's imperial adventure in the Philippines, American wars have inspired profound debate.
And nowhere more so in this election than San Antonio, Texas, nicknamed Military City because of its high population of veterans and serving soldiers, where Simon finds feelings about the war are deeply divided.
As with the great war elections of the past, it's a debate which forces America to dig deep and rediscover what it stands for.