The Seahawks joined the league in 1976 as a member of the NFC West division. A year later, they switched conferences with their expansion partners, the Tampa Bay Buccaneers, and joined the AFC West. They played in the American Conference until 2002, when, with league realignment, they were returned to the National Football Conference.

On September 26, 2004 the Seahawks shutout the San Francisco 49ers 34-0. This marked the end of the 49er's league record 27 year streak without a shutout - the last such game being Atlanta in 1977. While the 49ers were in a position to score in the 4th quarter, an interception and a fumble recovery sealed their fate. Some current players were either very young children or not even born when the last 49ers shutout occurred.

--Wikipedia