what does the last sentence mean?
【The substance of the meeting—their final conference together—is unclear. According to Johnson's recollection nineteen months later, "There definitely was not a disagreement. . . . There was an active discussion" in which the two "were in substantial agreement." He did not define the nature of the discussion, but if the memories of others are to be credited, the President and his successor had words over the state's political feud. Precisely what was said is unknown, for one President is dead, and a whirlwind was about to descend upon the other, blurring the sequence of events leading up to it. 】
1.I wonder what does "a whirlwind" indicate to?"
2." blurring the sequence of events leading up to it." does "events"here indicate to the result of that last meeting? then, what does "it" mean? I am not quite sure what exactly does it leading up to?