D.C. United is professional soccer (http://en.wikipedia.org/wiki/Association_football) club based in Washington, D.C. (http://en.wikipedia.org/wiki/Washington,_D.C.) which competes in Major League Soccer (http://en.wikipedia.org/wiki/Major_League_Soccer) (MLS). It is one of the ten charter clubs of MLS, having competed in the league since its inception, in 1996 (http://en.wikipedia.org/wiki/1996_Major_League_Soccer_season).
D.C. United has won 13 international and domestic titles or honors over the club's history (http://en.wikipedia.org/wiki/History_of_D.C._United). D.C. United was one of the most successful (http://en.wikipedia.org/wiki/Major_League_Soccer_records_and_statistics#All-Time_Most_Successful_MLS_Clubs) clubs in the early years of MLS, winning 8 of its 13 titles between 1996 and 1998 under head coach Bruce Arena (http://en.wikipedia.org/wiki/Bruce_Arena). United holds an MLS record for most MLS Cup (http://en.wikipedia.org/wiki/MLS_Cup) and Supporters' Shields (http://en.wikipedia.org/wiki/Supporters%27_Shield) apiece, winning each honor four times, and has won the U.S. Open Cup (http://en.wikipedia.org/wiki/Lamar_Hunt_U.S._Open_Cup) three times. United was also the first club to win both the MLS Cup and MLS Supporters' Shield consecutively.
On the international stage, D.C. United has competed in both the CONCACAF Champions League (http://en.wikipedia.org/wiki/CONCACAF_Champions_League) and its predecessor, the CONCACAF Champions' Cup. The club participated in the 2005 and 2007 editions of the Copa Sudamericana (http://en.wikipedia.org/wiki/Copa_Sudamericana). In 1998, the club won the CONCACAF Champions' Cup (http://en.wikipedia.org/wiki/1998_CONCACAF_Champions%27_Cup). (http://en.wikipedia.org/wiki/D.C._United#cite_note-8) Subsequently, United won the now-defunct Copa Interamericana (http://en.wikipedia.org/wiki/Copa_Interamericana), a CONCACAF-CONMEBOL super cup, in 1998 against Vasco da Gama of Brazil.
Chivas USA is a professional soccer (http://en.wikipedia.org/wiki/Association_football) club located in the Los Angeles (http://en.wikipedia.org/wiki/Los_Angeles) suburb of Carson, California (http://en.wikipedia.org/wiki/Carson,_California), which competes in Major League Soccer (http://en.wikipedia.org/wiki/Major_League_Soccer) (MLS).
The club became the eleventh MLS team upon its entry into the league in 2004. In Spanish, chivas means "goats (http://en.wikipedia.org/wiki/Goat)", and is the nickname of C.D. Guadalajara.
Chivas USA plays its home games at the StubHub Center (http://en.wikipedia.org/wiki/StubHub_Center) in Carson, which it shares with its rival, the Los Angeles Galaxy (http://en.wikipedia.org/wiki/Los_Angeles_Galaxy). The club was originally owned by Jorge Vergara (http://en.wikipedia.org/wiki/Jorge_Vergara), who also owns C.D. Guadalajara; in 2014, MLS purchased the club from Vergara with plans to sell it to new owners, who will rebrand the club in time for the 2015 season.
In 2005, Chivas USA kicked off its inaugural season in Major League Soccer (http://en.wikipedia.org/wiki/Major_League_Soccer) at The Home Depot Center (http://en.wikipedia.org/wiki/The_Home_Depot_Center) with a 2-0 loss to then MLS Cup (http://en.wikipedia.org/wiki/MLS_Cup) Champions D.C. United (http://en.wikipedia.org/wiki/D.C._United) on April 2, 2005,