Before the Civil War, most people escaping enslavement found help from white Quakers, who signaled them with quilts and lanterns. Right? Wrong! Most freedom seekers who had help got it from other Black people. Secret codes and messages weren't as common as you might think. The truth is, the Underground Railroad wasn't well-organized unit. It was a bunch of different people-shopkeepers, free Black sailors, and, yes, some Quaker abolitionists-doing...