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 2007 MLS supplemental draft was held on January 18, 2007, following the SuperDraft, as teams filled out their developmental rosters.
The 2006 Houston Dynamo season was the inaugural season of the club.
Toronto FC began play in Major League Soccer in 2007, and the club's first regular season match was on April 7, 2007, at the Home Depot Center in Los Angeles away to Chivas USA. Toronto FC suffered a 2–0 loss. Toronto's first home match was on April 28, 2007, at BMO Field against Kansas City Wizards. The home side lost 1–0 on an 81st-minute goal by Eddie Johnson.
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 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 Chivas USA season was the sixth season of the team's existence.
The 2010 Colorado Rapids season was the fifteenth year and season of the club's existence. It was Colorado's fifteenth year in Major League Soccer, and the fifteenth consecutive year for the club in the top-flight of American soccer.
The 2008 Real Salt Lake Season was the fourth season of the team's existence. It was the first season that the team made it to the MLS Cup Playoffs, thanks to some last minute heroics by Yura Movsisyan. After defeating Chivas USA in the first round of the playoffs, Real Salt Lake lost to New York Red Bulls in the Western Conference finals. The 2008 season was also the last season that Real Salt Lake played at Rice-Eccles Stadium, as they moved to the soccer-specific Rio Tinto Stadium on October 9, 2008.
The 2008 Chivas USA season was the club's fourth season of existence, and their fourth in Major League Soccer, the top flight of American soccer. The club competed in the MLS's Western Conference, where they finished in first place, in their Conference, qualifying for the Playoffs for the second time.
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 2005 Chivas USA season was the club's first season of existence, and their first in Major League Soccer, the top flight of American soccer. The club competed in the MLS's Western Conference, where they finished in sixth place, or last place, in the Conference.
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 2006 FC Dallas season was the tenth season of the Major League Soccer team. It was the most successful regular season in franchise history, and was the only time that the team secured the #1 seed in the Western Conference. After an elimination against the Colorado Rapids in a shootout in Game 2 of the Western Conference Semifinals, head coach Colin Clarke was fired and replaced by Steve Morrow. It was also the final season under owner Lamar Hunt, who died soon thereafter.
The 2007 FC Dallas season was the eleventh season of the Major League Soccer team. During the offseason, long-time owner and partial founder of the MLS Lamar Hunt died. His son, Clark Hunt, took control of the team. The team was invite to participate in the first SuperLiga tournament. The team did not make it out of the Group stage.
The 2008 FC Dallas season was the twelfth season of the Major League Soccer team. The team failed to make the postseason for the first time in four years.
The 2008 Columbus Crew season was the club's thirteenth season of existence and their thirteenth consecutive season in Major League Soccer, the top flight of American soccer. Columbus also competed in the U.S. Open Cup and the MLS Cup Playoffs. The season covered the period from November 14, 2007 to the start of the 2009 Major League Soccer season.
The 2007 Chivas USA season was the club's third season of existence, and their third in Major League Soccer, the top flight of American soccer. The club competed in the MLS's Western Conference, where they finished in first place, in their Conference, qualifying for the Playoffs for the second time.
