What is the single-bullet theory?

Explanation:

Generally credited to Warren Commission staffer Arlen Specter (later a United States Senator from Pennsylvania), this theory posits that a single bullet, known as "Warren Commission Exhibit 399" (or "CE 399") caused all the wounds to the governor and the non-fatal wounds to the president, which totals up to seven entry

albany plan of union, 1754. the albany plan of union was a plan to place the british north american colonies under a more centralized government

there is no image for me to refer