Jeffery Robinson connects the dots between America’s racist past and its present in “Who We Are: A Chronicle of Racism in America,” a thorough examination of our country’s history and its reverberations today. Early on Robinson, the deputy legal director of the national ACLU, schools a protestor holding a Confederate flag who argues the Civil War was not about race. Robinson is polite enough to shake the man’s hand after their interaction, but as he drives off he says, bemused, “it seems like facts were not important to this gentleman.” Facts are important to Robinson, and he packs “Who We Are…