Question: What collegiate football conference started in July 1999, and was home to the winners of the 2011 Rose Bowl?

Context paragraphs:
1976 Rose Bowl: The 1976 Rose Bowl was a college football bowl game played on January 1, 1976.  It was the 62nd Rose Bowl Game.  The UCLA Bruins defeated the number one ranked and undefeated Ohio State Buckeyes 23–10 in a rare bowl rematch of a regular season game.  UCLA quarterback John Sciarra was named the Rose Bowl Player Of The Game.  This was the first post season that football teams from the Big Ten Conference and Pacific-10 Conference could appear in other bowl games since the Rose Bowl agreement was signed for the 1947 Rose Bowl.  This game marked Ohio State coach Woody Hayes' last appearance in the Rose Bowl game.

Mountain West Conference: The Mountain West Conference (MW) is one of the collegiate athletic conferences affiliated with the National Collegiate Athletic Association (NCAA) Division I Football Bowl Subdivision (FBS) (formerly I-A).  The MW officially began operations in July 1999.  Geographically, the MW covers a broad expanse of the Western United States, with member schools located in California, Colorado, Hawaii, Idaho, Nevada, New Mexico, Utah, and Wyoming.  Craig Thompson has served as Commissioner of the MW since its founding in 1999.

1987 Rose Bowl: The 1987 Rose Bowl was a college football bowl game played on January 1, 1987, at the Rose Bowl in Pasadena, California.  It was the 73rd Rose Bowl Game.  The Arizona State Sun Devils, champions of the Pacific-10 Conference, defeated the Michigan Wolverines, champions of the Big Ten Conference, 22–15.  Arizona State quarterback Jeff Van Raaphorst was named the Rose Bowl Player of the Game.  This was the first appearance for Arizona State in the Rose Bowl.

Gary Patterson: Gary Allen Patterson (born February 13, 1960) is an American football coach and former player.  He is the head football coach at Texas Christian University and the winningest coach in Horned Frogs' history.  Patterson has led the TCU Horned Frogs to six conference championships—one Conference USA title in 2002; four Mountain West Conference titles in 2005, 2009, 2010 and 2011; and one Big 12 Conference title in 2014—and nine bowl game victories—including victories in the 2011 Rose Bowl and 2014 Peach Bowl.  His 2010 squad finished the season undefeated at 13–0 after a 21-19 Rose Bowl victory over the Wisconsin Badgers on New Year's Day 2011, and ranked second in the final tallying of both major polls.

1999 Rose Bowl: The 1999 Rose Bowl was the 85th Rose Bowl game and was played on Friday January 1, 1999, at the Rose Bowl Stadium in Pasadena, California.  It was a college football bowl game at the end of the 1998 NCAA Division I-A football season.  Wisconsin defeated UCLA by a score of 38-31.  Ron Dayne of Wisconsin was named the Rose Bowl Player of the Game.  He tied a modern Rose Bowl record with four touchdowns.  This was the first year that the Rose Bowl became part of the Bowl Championship Series, ending a long-standing agreement between the Big Ten and the "West Representative" (PCC/AAWU) and the first year that the game was branded with corporate sponsorship.  Unlike the other bowl games, the sponsor was not added to the title of the game, but instead as a presenter, so it became known as The Rose Bowl Game presented by AT&T.

2011 Pac-12 Football Championship Game: The 2011 Pac-12 Football Championship Game was played on Friday, December 2, 2011 at Autzen Stadium in Eugene, Oregon to determine the 2011 football champion of the Pac-12 Conference.  The game featured the UCLA Bruins of the South Division against the Oregon Ducks of the North Division.  It was the first football conference championship for the Pac-12 Conference, or any of its predecessors.  The game took place at Oregon's Autzen Stadium, as the Ducks' conference record of 8–1 was better than UCLA's record of 5–4 .  The Ducks defeated the Bruins 49-31, and would earn a berth in the 2012 Rose Bowl.  At the Rose Bowl Game, the Ducks defeated the Wisconsin Badgers 45–38 for the Rose Bowl Championship trophy.

1947 Rose Bowl: The 1947 Rose Bowl was a college football bowl game.  It was the 33rd Rose Bowl Game.  The Illinois Fighting Illini defeated the UCLA Bruins, 45–14.  Illinois halfbacks Buddy Young and Jules Rykovich shared the Rose Bowl Player Of The Game award.  They were named the Rose Bowl Players Of The Game when the award was created in 1953 and selections were made retroactively.  It was the first Rose Bowl game that featured teams from the Pacific Coast Conference and the Big Nine Conference by the terms of an exclusive five-year agreement.  It is known as the first "modern" Rose Bowl, and the modern Rose Bowl records date back to this game.  This exclusive agreement remained in place until the 1999 Rose Bowl when the Rose Bowl became part of the Bowl Championship Series, with the exception of the games from 1960 onward following the collapse of the PCC and prior to the renegotiation with the newly formed Athletic Association of Western Universities (AAWU), highlighted by the 1962 Rose Bowl where Big Ten champion Ohio State declined the invitation.

2011 Rose Bowl: The 2011 Rose Bowl was the 97th edition of the annual bowl game played on January 1, 2011, as part of the 2010 NCAA Division I FBS football season.  Played in Pasadena, California, the TCU Horned Frogs of the Mountain West Conference defeated the Wisconsin Badgers of the Big Ten Conference by a score of 21 – 19.  The Pasadena Tournament of Roses Association was the organizer of the game.  Vizio Inc. was the corporate sponsor and the game was officially named "The Rose Bowl Game presented by Vizio".  This game marked the first time a team from a non-Automatic Qualifying Conference won the Rose Bowl since the 1934 game when Columbia beat Stanford, 7‐0.

1922 Rose Bowl: The 1922 Rose Bowl was a college football bowl game played on January 2, 1922, between the Washington & Jefferson Presidents (W&J) and the California Golden Bears.  It holds several distinctions including being the only scoreless Rose Bowl Game, the first tie in a Rose Bowl, the first African-American quarterback to play in the Rose Bowl (Charles Fremont West from Washington & Jefferson), the first freshman to play in a Rose Bowl (Herb Kopf of Washington and Jefferson), and Hal Erickson (W&J) became the only man ever to play in two different Rose Bowls (1919 and 1922), with two different teams (Great Lakes Navy and W&J), without losing.  It was also the last to be played at Tournament Park and to be officially known as the Tournament East-West Football Game, and with only 450 students at the time, Washington & Jefferson College was the smallest school to ever play in a Rose Bowl.

2014 Rose Bowl: The 2014 Rose Bowl was a college football bowl game that was played on January 1, 2014 at the Rose Bowl stadium in Pasadena, California.  This 100th Rose Bowl Game matched Big Ten Conference Champions Michigan State Spartans against Pac-12 Conference Champions Stanford Cardinal (the defending Rose Bowl champions), a rematch of the 1996 Sun Bowl.  It was one of the 2013–14 bowl games that concluded the 2013 FBS football season.  The first game in the final edition of the Bowl Championship Series, it was sponsored by the Vizio consumer electronics company, and officially titled the Rose Bowl Game presented by Vizio.

Supporting paragraphs: 2011 Rose Bowl Mountain West Conference
Answer: Mountain West Conference