Seattle Sounders FC joined Major League Soccer in 2009, becoming part of the league's expansion. The club quickly established itself in Seattle, building a passionate fanbase and a competitive roster.
Since their founding, Seattle Sounders has worked to build a strong identity in Seattle, investing in youth development, community outreach, and on-field competitiveness. The club's history is intertwined with the growth of soccer culture in Washington and the broader expansion of MLS across North America.