When Muhammad Ali died on June 3, 2016 at the age of 74, his immortality had already been long guaranteed.  President Barack Obama summed up the feelings of many when he proclaimed, “Muhammad Ali was America.  He will always be America.  What a man.  What a spirit.  What a joyous, mighty champion.”  It was no accident that history’s only three-time lineal heavyweight champion, the man born Cassius Marcellus Clay, Jr., was nicknamed “The Greatest.”  That moniker also was used for the title of the champ’s 1975 memoir and its 1977 Columbia Pictures…