Seattle Sounders FC became a member of Major League Soccer in 2009. The club joined as part of MLS's ongoing expansion, which has grown the league from 10 teams to 30. Each expansion has brought new markets and fanbases to the league.
Seattle Sounders FC became a member of Major League Soccer in 2009. The club joined as part of MLS's ongoing expansion, which has grown the league from 10 teams to 30. Each expansion has brought new markets and fanbases to the league.