How did John f. Kennedy death affect America? What was the impact of this national loss?

Fear and a dramatic change in the Secret Service.

Explanation:

John F Kennedy was assassinated on November 22 1963 in Dallas, Texas. The weapon used for the assassination was a 6.5×52mm Carcano Model 91/3 infantry rifle. The assassin fired 2 shots from a building near the area the Convoy was passing thru. After the assassination the Secret Service task force and the vehicles used by the Secret Service dramatically changed. For example now you will never see the president go on a public drive in a convertible and now you will always see the Secret Service snipers on the Rooftops of every single building within the perimeter of the escort.Helicopters now are also present with snipers on them. In fact now the Employee count of the Secret Service exceeds 6,500 thousand Agents.