Who are the most relevant and inspiring heroes from American history? On this year-end episode of Now & Then, “Historians Have Their Heroes,” Heather Cox Richardson and Joanne Freeman discuss their definitions of American heroism and the figures–from Ida B. Wells, to Sitting Bull, to Pete Seeger–who they most admire. What attributes do these political and cultural leaders share? What is the point of having heroes? And how can we honor those who most deserve recognition?