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 Oct. 22, 1962 file photo, U.S. President John F. Kennedy addresses the nation by television and radio from the Oval Office in Washington, announcing a U.S. naval blockade of Cuba. (AP Photo/WOA)

FILE - In this Oct. 22, 1962 file photo, U.S. President John F. Kennedy addresses the nation by television and radio from the Oval Office in Washington, announcing a U.S. naval blockade of Cuba. (AP Photo/WOA)

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