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.

FILE - In this November 1963 file photo, mourners leave flowers on the lawn near the Texas Book Depository after the assassination of President John F. Kennedy in Dallas. (AP Photo/File)

FILE - In this November 1963 file photo, mourners leave flowers on the lawn near the Texas Book Depository after the assassination of President John F. Kennedy in Dallas. (AP Photo/File)

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