The Western Conference is one of Major League Soccer's two conferences, along with the Eastern Conference. As of 2023, the division of the Conferences broadly follows the path of the Mississippi River from the Great Lakes to the Gulf of Mexico, with clubs on, or west of the River in the Western Conference.
The 2009 Chivas USA season was the fifth season of the team's existence. It began on March 21 with a 2-1 home win over the Colorado Rapids, and ended with a 3-2 aggregate loss to the Los Angeles Galaxy in the first round of the playoffs.
The 2009 Colorado Rapids season was the fourteenth season of the team's existence. It began on March 21 with a 2–1 loss at Chivas USA and ended on October 24 with a 3–0 loss to Real Salt Lake. The result put RSL in the playoffs as the 8th seed and kept Colorado out on goal differential.
The 2009 FC Dallas season was the fourteenth season of the team's existence. It began on March 21 with a 3–1 home loss to the Chicago Fire and ended with a 2–1 away loss to Seattle Sounders FC on October 24. A win in that game would have sent the team to the playoffs.
The 2009 San Jose Earthquakes season was the twelfth season of the team's existence, and the second since its revival. The season began with a 1-0 home loss to the New England Revolution on March 21, and ended with a 2-0 loss at the Los Angeles Galaxy on October 24.
The 2009 Real Salt Lake season was the fifth season of the team's existence. After clinching the eighth and final spot in the 2009 MLS Cup Playoffs, Real Salt Lake would go on to defeat the Los Angeles Galaxy in the 2009 MLS Cup. The team was the first team in MLS history to win the MLS Cup after finishing the regular season with a losing record (11–12–7).
The 2010 Houston Dynamo season was the fifth season of the team's existence since joining Major League Soccer (MLS) prior to the 2006 season. It was the team's fifth season with head coach Dominic Kinnear, majority owner Philip Anschultz, and chief operating officer Chris Canetti. On June 10, team president Oliver Luck left the Dynamo to become athletic director for his alma mater, West Virginia University.
The 2010 Los Angeles Galaxy season was the club's fifteenth season of existence. It was also the Galaxy's fifteenth season in Major League Soccer and their fifteenth-consecutive year at the top-flight of American soccer.
The 2011 Los Angeles Galaxy season was the club's 17th year of existence as well as their 16th season in Major League Soccer and their 16th consecutive year in the top-flight of American soccer. The Galaxy entered the season as the defending MLS Supporters' Shield titleholders.
The 2012 Los Angeles Galaxy season was the club's 18th year of existence as well as their 17th season in Major League Soccer (MLS) and their 17th consecutive year in the top-flight of American soccer. The Galaxy entered the season as both the defending MLS Cup and Supporters' Shield winners.
The 2012 FC Dallas season was the seventeenth of the team's existence. The team's first game was on March 11 at FC Dallas Stadium. The team failed to make the playoffs for the first time since 2009.
The 2008 Colorado Rapids season was the thirteenth season of the team's existence. Colorado began their season with 4–0 victory over the Los Angeles Galaxy and ended a 1–1 draw against Real Salt Lake. They finished 4th in the Western Conference and 9th overall, 1 point behind the New York Red Bulls for the final Wild Card Playoff spot. In the U.S. Open Cup Qualifying, Colorado defeated the Los Angeles Galaxy 1–0 before losing in Kansas City in a penalty shootout.
The 2006 Real Salt Lake season was the second season of the team's existence. The team has some improvement over the previous season. However, despite mixed results on the field, RSL scored a huge victory off the field in 2006. After much controversy and debate, the franchise finally secured a guarantee for a state-of-the-art, soccer-specific stadium to be built in Sandy – a suburb of Salt Lake City. The team broke ground for the structure on the morning of August 12, with representatives from soccer giant Real Madrid present. That evening, RSL faced its namesake in front of a sellout crowd of 45,511 fans at Rice-Eccles Stadium. Salt Lake made a good showing, but Real Madrid won the exhibition match, 2–0.
The 2008 San Jose Earthquakes season was the eleventh season of the team's existence, and the first in their return to the league after a two-year hiatus.
The 2013 FC Dallas season was the eighteenth of the team's existence. The team began their preseason by signing three new players to the squad: Stephen Keel, Peter Luccin, and Pipico.
The 2005 San Jose Earthquakes season was the tenth season of the team's existence and last before their move to Houston to become the Houston Dynamo. The season also marked the franchise's first Supporters' Shield.
The 2013 Chivas USA season was the club's ninth season of existence, and their ninth season in Major League Soccer, the top tier of the American and Canadian soccer pyramids. Chivas USA looked to rebound off a disappointing season, which saw the club finish at the bottom of the Western Conference table.
The 2013 San Jose Earthquakes season was the club's 16th year of existence, as well as its 16th season in Major League Soccer and its sixth consecutive season in the top-flight of American soccer. Including all previous franchises, this is the 31st year with a soccer club in the San Jose area sporting the name "Earthquakes".
The 2014 Real Salt Lake season was the team's tenth year of existence and also the first year with new head coach Jeff Cassar. The team's first game was on March 8 at StubHub Center.
