50 years later: The unfulfilled promise of John F. Kennedy and his generation-defining death

The nation marks a half-century since the assassination of President John F. Kennedy. Many who were alive on that fateful day recall exactly where they were and what they were doing.

First lady Jacqueline Kennedy and President John F. Kennedy stand at attention during the playing of the national anthem at start of a reception during their state visit to Mexico City, Mexico, on June 30, 1962.  (AP Photo/Henry Burroughs)

First lady Jacqueline Kennedy and President John F. Kennedy stand at attention during the playing of the national anthem at start of a reception during their state visit to Mexico City, Mexico, on June 30, 1962. (AP Photo/Henry Burroughs)

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