The conclusion of this biography of Ulysses S. Grant (1822-85) covers the last 20 years of the life of "the most popular man of the 19th century," as historian Donald Miller calls him. Grant's presidency (1869-77) wasn't the reason. "Military uniforms kept the sides straight on the battlefield, but in Grant's new world it was not so easy to tell friends from enemies," says narrator Liev Schreiber, and some of Grant's political "friends" were crooks. Add to that the intense opposition of white southerners to his Reconstruction policies. Then the U.S. economy went south during the panic of 1873.