Question: When did the astros become an american league team?

Disambiguated questions and answers:
context: The Houston Astros won their first American League game on March 31, 2013 against the Texas Rangers. The score was 8–2. On September 29, the Astros completed their first year in the American League, losing 5–1 in a 14 inning game to the New York Yankees. The Astros finished the season with a 51–111 record (a franchise worst) with a season ending 15 game losing streak, again surpassing their worst record from last season. The team finished 45 games back out of the division winner Oakland Athletics, further adding to their futility. This marked three consecutive years that the Astros had lost more than 100 games in a single season. They also became the first team to have the first overall pick in the draft three years in a row. They improved on their season in 2014, going 70–92, finishing 28 games back over the division winner Los Angeles Angels of Anaheim, and placing fourth in the AL West over the Texas Rangers. After a slow start, the Astros took over first place in the AL West on April 19 and stayed there until shortly before the All-Star Break in mid-July. The Astros retook first place on July 29, but fell from first on September 15.
question: What year did the astros become an american league team?
short_answers: 2013
wikipage: History of the Houston Astros
context: On November 15, 2011, it was announced that Crane had agreed to move the franchise to the American League for the 2013 season. The move was part of an overall divisional realignment of MLB, with the National and American leagues each having 15 teams in three geographically balanced divisions. Crane was given a $70 million concession by MLB for agreeing to the switch; the move was a condition for the sale to the new ownership group. Two days later, the Astros were officially sold to Crane after the other owners unanimously voted in favor of the sale. It was also announced that 2012 would be the last season for the Astros in the NL. After over fifty years of the Astros being a part of the National League, this move was unpopular with many Astros fans.
question: When did the astros agree to become an american league team?
short_answers: November 15, 2011
wikipage: Houston Astros

Long-form answers:
knowledge: content: The Houston Astros are an American professional baseball team based in Houston. The Astros compete in Major League Baseball (MLB) as a member club of the American League (AL) West division, having moved to the division in 2013 after spending their first 51 seasons in the National League (NL).[4][5]
wikipage: Houston Astros
long_answer: The Houston Astros are an American professional baseball team based in Houston. The Astros compete in Major League Baseball (MLB) as a member club of the American League (AL) West division, having moved to the division in 2013 after spending their first 51 seasons in the National League (NL). On November 15, 2011, it was announced that Crane had agreed to move the franchise to the American League for the 2013 season. The move was part of an overall divisional realignment of MLB, with the National and American leagues each having 15 teams in three geographically balanced divisions. The Houston Astros won their first American League game on March 31, 2013 against the Texas Rangers. The score was 8–2.