Question: The major league soccer team, in which R.J. Allen is a defender for, began in which year? 

Context paragraphs:
Omid Namazi: Omid Namazi (Persian: امید نمازی‎ ‎ ) is a retired Iranian-American soccer defender and currently head coach of the United States men's national under-18 soccer team.  Namazi played professionally in the American Soccer League, American Professional Soccer League, Major League Soccer, USISL and National Professional Soccer League where he was the 2001 Defender of the Year.  He is a two-time Coach of the Year in the Major Indoor Soccer League and coached in the Women's United Soccer Association.  As assistant coach of Iran, he led the team to qualification to the 2014 FIFA World Cup and the 2015 AFC Asian Cup.

Major League Soccer owners: Major League Soccer owners own a share in the league and have the right to operate a team.  Major League Soccer operates under a single-entity structure in which teams and player contracts are centrally owned by the league.  Each Major League Soccer team has an investor-operator that is a shareholder in the league.  In order to control costs, the league shares revenues and holds players contracts instead of players contracting with individual teams.

R. J. Allen: Robert James "R. J." Allen (born April 17, 1990) is an American professional soccer player who currently plays as a defender for New York City FC in Major League Soccer.  Allen is the older brother of soccer player Brandon Allen.

Jorge Salcedo: Jorge Salcedo (born September 27, 1972 in Cerritos, California) is the current head coach of the UCLA Bruins men's soccer team.  He is a retired American soccer defender who played professionally in Mexico and Major League Soccer.  He earned three caps with the United States men's national soccer team.

Fernando Clavijo: Fernando Caetano Clavijo Cedrés (born January 23, 1956) is a retired American soccer defender and former head coach of the Colorado Rapids of Major League Soccer.  He played three seasons in the American Soccer League, two in the North American Soccer League and ten in the Major Indoor Soccer League.  He earned 61 caps with the United States men's national soccer team and 8 with the U.S. National Futsal Team.  He later coached both indoor and outdoor teams as well as at the national team level with Nigeria and Haiti.  He is a member of the National Soccer Hall of Fame and is a 2014 inductee into the Indoor Soccer Hall of Fame.

Miles Joseph: Miles Joseph (born May 2, 1974) is an American soccer manager and retired U.S. soccer player who earned three caps with the United States national soccer team.  He spent six seasons in Major League Soccer and the part of one season in Major Indoor Soccer League.  He was also a member of the U.S. soccer team at the 1996 Summer Olympics.  He is currently an assistant coach for Orlando City SC in Major League Soccer.

Seattle Sounders FC results by opponent: Seattle Sounders FC is an American soccer club founded in 2008, after the city of Seattle was awarded a Major League Soccer (MLS) franchise.  The club began playing competitive soccer in the 2009 Major League Soccer season.  It plays its home games at CenturyLink Field, competing in the Western Conference of the MLS.  The current Sounders FC is the third soccer team from Seattle to bear the "Sounders" nickname.  The tradition was started by Seattle's North American Soccer League team in 1974, and continued by the city's United Soccer Leagues side, formed in 1994.  The current Sounders FC is an entity distinct to both of these clubs, and played its first MLS game on March 19, 2009, against the New York Red Bulls.

Cle Kooiman: Christopher Clemence "Cle" Kooiman (born July 3, 1963) is a retired American soccer defender.  He played professionally in both Mexico and the United States including the first Major Indoor Soccer League, Western Soccer Alliance, American Professional Soccer League and Major League Soccer.  He earned twelve caps, scoring one goal, with the U.S. national soccer team in 1993 and 1994.  He was a member of the U.S. team at the 1994 FIFA World Cup.

John Doyle (soccer): John Joseph Doyle (born March 16, 1966) is a retired American soccer player who played professionally in both Europe and the United States including the Western Soccer League, American Professional Soccer League and Major League Soccer.  He was the 1995 A-League Defender of the Year and the 1996 MLS Defender of the Year.  He also earned fifty-three caps with the U.S. national team between 1987 and 1994 including two games at the 1990 FIFA World Cup.  He was a member of the U.S. team at the 1988 Summer Olympics and was most recently the general manager of the San Jose Earthquakes of Major League Soccer before being fired on August 29, 2016.

New York City FC: New York City FC is an American professional soccer club based in New York City that competes in Major League Soccer (MLS).  NYCFC began play in 2015, as an expansion team of the league.  The club is the first MLS franchise based in the city, and the second franchise in the New York metropolitan area after the New York Red Bulls, based in Harrison, New Jersey.

Supporting paragraphs: R. J. Allen New York City FC
Answer: 2015