Part fact and part opinion, mainly of Jim Garrison(Kevin Costner) and director Oliver Stone, as to the events surrounding the proposed conspiracy of the assassination of President John Fitzgerald Kennedy on November 22, 1963 in Dallas, Texas. New Orleans District Attorney Jim Garrison began a probe into the actions of the F.B.I. and other officials of whom he suspected where covering up information that could lead to evidence of multiple shooters. The motive is believed to be to escalate the United States involvement in the Vietnam War. President Kennedy was attempting to prevent any further involvement in this situation, but which Vice President Lyndon B. Johnson supposedly promised the United States government that he would "give them the war". Thus, the motive for eliminating President Kennedy. The movie also details the events of many people involved in the assassination, from Lee Harvey Oswald to Clay Shaw, a prominent figure in New Orleans.