Seattle Sounders FC is an American professional soccer club based in Seattle, Washington. The Sounders compete as a member of the Western Conference of Major League Soccer (MLS) and are the league's current defending champions, having won the 2016 MLS Cup. The club was established on November 13, 2007, and began play in 2009 as an MLS expansion team. The Sounders are the third Seattle soccer club to share the Sounders name being part of a legacy which traces back to the original team of the NASL in 1974.
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