49ers-Seahawks Is NFL’s Most Heated Rivalry, But How Did We Get Here? If you’ve taken a moment to browse online comments related to this weekend’s San Francisco 49ers and Seattle Seahawks NFC Championship matchup you know one thing, this is very personal for fans of on both sides. Unlike the Giants-Dodgers rivalry, which has aged like a fine wine over decades of competition and the move west from New York, this rivalry’s origins are far less apparent.

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