Question: How did the world react after John F Kennedy's assassination.
About the article "Assassination of John F. Kennedy", section "Reaction to the assassination".

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Haas wrote an account of Hampton's murder, entitled "The Assassination of Fred Hampton: How the FBI and the Chicago Police Murdered a Black Panther" (2009).
Stephen King refers to Hampton in the novel "11/22/63" (2011), where a character discusses the ripple effect of traveling back in time to prevent President John F. Kennedy's assassination, which the character postulates would give rise to a series of events that could prevent Fred Hampton's assassination, as well. 
"JFK in Ireland" serves as a profile of John F. Kennedy's 1963 visit to Ireland while he was President of the United States.
Kennedy referred to this visit as "the best 'four days of his life'" and it occurred five months before his assassination.
Tubridy's book discusses how Kennedy's visit affected the country, wondering if it was an inspirational one and featuring rare photographs and personal documents. 
While the historical president Garfield did die as a result of an assassin's bullet, the film's historical accuracy does not extend much further than that.
While Garfield actually died from complications of the wound months after the actual event, in the film he dies shortly after the shooting.
Furthermore, the film's events take place in Dallas, Texas while Garfield was in actuality shot in Washington, D.C..
In addition to taking place in the same city, the link to the assassination of another president of the United States, John F. Kennedy, is strengthened by the imagery used in the assassination scene, which imitates the Zapruder film of Kennedy's assassination. 
Kenneth Patrick "Kenny" O'Donnell (March 4, 1924 – September 9, 1977) was a top aide to U.S. President John F. Kennedy and part of the group of Kennedy's close advisors called the "Irish Mafia".
He served as organizer and director of Kennedy's presidential campaign schedule in 1960, as Kennedy's special assistant and appointments secretary 1961–1963, as Lyndon Johnson's Presidential Aide 1963–1965, and as campaign manager for Robert Kennedy in the 1968 presidential election campaign and, after Kennedy's assassination, for Hubert Humphrey. 
The CIA had a number of high profile conflicts with the President Kennedy.
The conflicts included disagreements over the CIA's assassination program, many details of which later becoming public as part of the Church Committee.
In one instance, the CIA provided $42,000 to the plotters of the assassination of President Diem of Vietnam, which was carried out by Lucien Conein.
Robert S. McNamara and White House historian Arthur M. Schlesinger, Jr. both stated that President Kennedy went pale when he heard the news about the "coup", and was shocked that Diem had been murdered.
Kennedy's relationship with the CIA was strained considerably following the failed Bay of Pigs Invasion.
He remarked that he wanted "to splinter the CIA into a thousand pieces and scatter it to the winds."
The CIA had claimed, however, that this animosity was short lived.
In CIA Deputy Director for Intelligence John L. Hegerson's words, "the [CIA's] relationship with Kennedy was not only a distinct improvement over the more formal relationship with Eisenhower, but would only rarely be matched in future administrations."
While the CIA's budget has always been classified, ranking CIA official William Colby made it clear when he wrote, "the fact of the matter is that the CIA could not have had a better friend in a President than John F. Kennedy.
He understood the Agency and used it effectively, exploiting its intellectual abilities to help him analyze a complex world, and its paramilitary and covert political talents to react to it in a low-key way.
"Despite the claims that relations with the agency were only momentarily strained, the embarrassment to the U.S. government and to the CIA due to the failed invasion, the withholding of intelligence, and a general atmosphere of distrust led to the Kennedy brothers firing Allen Dulles, Richard M. Bissell, and Charles P. Cabell in November 1961.
Allen Dulles, who had been the head of the CIA, was replaced by John McCone.
After Kennedy's assassination, Dulles lobbied hard to be a part of the investigation.
An article concerning Kennedy's relationship with the CIA was written by journalist Arthur Krock, and published in the New York Times on 3 October 1963.
The article, entitled "The Intra-Administration War in Vietnam", quotes a high-ranking official in the government as saying "CIA's growth was likened to a malignancy" which this "very high official was not even sure the White House could control ... any longer.
If the United States ever experiences [an attempt at a "coup" to overthrow the government it will come from the CIA and not the Pentagon."
The "agency represents a tremendous power and total unaccountability to anyone."