"Personal Memoirs of U. S. Grant, Part 4." by Ulysses S. Grant is an autobiography written in 1884-1885. This final volume captures Grant's military career during the Mexican-American War and the Civil War, written under extraordinary circumstances. Racing against terminal throat cancer and personal bankruptcy from a Ponzi scheme, Grant penned his memoirs to save his family from financial ruin. Mark Twain, his close friend, championed the work's publication, creating an innovative marketing campaign that made it a nineteenth-century bestseller and secured Grant's legacy. (This is an automatically generated summary.)