....concepts that still help me make sense of the world, like the "racial nadir" — the downturn in American race relations, starting after Reconstruction, that saw the rise of lynchings and the Ku Klux Klan. In doing so, Lies My Teacher Told Me overturned one assumption embedded in the history classes I'd been sitting through all my life: that the United States is constantly ascending from greatness to greatness. "I started out the new edition with the famous two photographs of the inaugural crowds of this guy named President Obama, his first inauguration, and this guy named President Trump, his...