D.C. United is an American professional soccer club based in Washington, D.C. The club competes in Major League Soccer (MLS) as a member of the Eastern Conference. Domestically, the club has won four MLS Cups, four Supporters' Shields, three U.S. Open Cups, and six Eastern Conference championships. In international competitions, the club has one CONCACAF Champions Cup title and one Copa Interamericana, the only United States team to win the latter. In terms of trophies won, it is the joint-most successful overall club in American soccer.