what does the nation's stride"mean?
Rufus Youngblood's hour in history—it lasted almost exactly an hour—was nearly at an end. It was a freak, an outgrowth of the panic and uncertainty which had briefly broken the nation's stride. Once the new Chief Executive felt secure the Secret Service was destined to fade back into the shadows, and for Lyndon Johnson security returned when he had been extricated from the vortex of Dallas. Climbing the ramp ended the threat. Only a return to the city could renew it, and he had no intention of flirting again with whatever dark forces lurked in those sunlit streets. He had been badly scarred. 】