Title: 2017 American League Championship Series
Content:  The 2017 American League Championship Series was a best-of-seven playoff pitting the Houston Astros against the New York Yankees for the American League pennant and the right to face the Los Angeles Dodgers in the 2017 World Series. The Astros defeated the Yankees in seven games after falling behind three games to two. The home team won every game in the series. This was the first time in history that the ALCS and NLCS teams were from the four most populous U.S. cities: New York, Los Angeles, Chicago, and Houston. For the first time, Major League Baseball sold presenting sponsorships to all of its postseason series; this ALCS was sponsored by Camping World and was officially known as the American League Championship Series presented by Camping World. The Astros would go on to defeat the Los Angeles Dodgers in the World Series in seven games, winning their first World Series championship in franchise history.
Title: 2017 American League Division Series
Content:  2017 ALDS (3–1): Houston Astros defeated Boston Red Sox.
Title: 2017 American League Championship Series
Content:  2017 ALCS (4–3): Houston Astros beat New York Yankees.
Title: 2017 American League Division Series
Content:  2017 ALDS (3–2): New York Yankees defeated Cleveland Indians.
Title: 2017 American League Division Series
Content: (1) Cleveland Indians (Central Division champions) versus (4) New York Yankees (Wild Card Game winner): Yankees win series 3–2. ; (2) Houston Astros (West Division champions) versus (3) Boston Red Sox (East Division champions): Astros win series in 3–1. The 2017 American League Division Series were two best-of-five-games series held to determine the participating teams in the 2017 American League Championship Series. The three divisional winners (seeded 1-3) and a fourth team—the winner of a one-game Wild Card playoff—played in two series. These matchups were: For the first time, Major League Baseball sold presenting sponsorships to all of its postseason series; Doosan acquired presenting sponsorship to the ALDS, and thus the series was officially known as the American League Division Series presented by Doosan. The Astros would go on to defeat the Yankees in the ALCS, then win the 2017 World Series over the National League champion Los Angeles Dodgers. It was the Astros first-ever World title.
Title: 2017 Houston Astros season
Content:  the Astros met the Red Sox at home in the AL Division Series (ALDS), and defeated them in four games. Houston then advanced to the AL Championship Series (ALCS) and defeated the New York Yankees in seven games for their first American League pennant. Combined with their NL pennant in 2005, the Astros became the first MLB team to make it to the World Series as members of both the National and American Leagues. Finally, the Astros faced and defeated the Los Angeles Dodgers in the 2017 World Series 4 games to 3. The 2017 Astros featured the highest-scoring offense in the major leagues (896 runs scored), including the highest batting 
Title: 2017 in baseball
Content:  Park, to clinch the first back-to-back American League East titles in franchise history. With the win, the Red Sox avoided a possible tiebreaker against their direct rival New York Yankees. With the Boston win, the Yankees were left with a wild-card spot and a one-game matchup against the Minnesota Twins for the right to play against the Cleveland Indians in the best-of-five AL Division Series. Besides, the Boston victory set up an immediate rematch with the AL West champion Astros in the ALDS, starting on October 5 in Houston. ; Later in the day, the Colorado Rockies clinched the second wild 
Title: 2017 American League Championship Series
Content:  The Astros defeated the Boston Red Sox 3–1 in the 2017 American League Division Series (ALDS). This is the Astros' fifth appearance in a League Championship Series, and their first since transferring from the National League to the American League. Their only previous LCS win came in the 2005 National League Championship Series; they lost in 1980, 1986, and 2004. They are also the first AL West team to make it to the ALCS since 2011. The Yankees upset the heavily-favored Cleveland Indians 3–2 in the ALDS to advance. This is the Yankees' 16th appearance in the ALCS, and their second as a Wild Card. Their last ALCS appearance came in the 2012 American League Championship Series where they got swept by the Detroit Tigers. They had won in 11 of their previous 15 appearances. This is the sixth straight year in which an AL East team has made it to the ALCS. This was the second postseason match-up between these two teams, with the Astros defeating the Yankees in the 2015 American League Wild Card Game at Yankee Stadium. This was also the first ALCS to not feature any American League Central Division teams since 2010.
Title: 2020 American League Championship Series
Content:  This was the first League Championship Series to reach a Game 7 since the 2017 ALCS, won by Houston over the New York Yankees. The starting pitchers, Lance McCullers Jr. for Houston and Charlie Morton for Tampa Bay, had both pitched for Houston in Game 7 of the 2017 ALCS and Game 7 of the 2017 World Series. Tampa Bay became the first MLB team to win a Game 7 after taking a 3-0 series lead. Concluding matters was Pete Fairbanks, who got Aledmys Díaz to fly out to Manuel Margot, to end the Astros' season and win the second AL pennant for Tampa Bay, the first in 12 seasons. Fairbanks earned his second save this postseason. The Rays became just the second team to win both a division series winner-take-all Game 5 and a League Championship Series winner-take-all Game 7 in the same year (after the 2012 San Francisco Giants).
Title: 2017 in sports
Content: April 2 – October 1: 2017 Major League Baseball season ; American League winners: Houston Astros ; National League winners: Los Angeles Dodgers ; June 12 – 14: 2017 Major League Baseball draft in Secaucus, New Jersey ; #1 pick: Royce Lewis (to the  Minnesota Twins from  JSerra Catholic High School) ; July 11: 2017 Major League Baseball All-Star Game in Miami at Marlins Park ; The American League defeated the National League, 2–1. ; MVP: 🇩🇴 Robinson Canó ( Seattle Mariners) ; 2017 Major League Baseball Home Run Derby winner: Aaron Judge ( New York Yankees) ; 2017 All-Star Futures Game: The World Team defeated the 🇺🇸, 7–6. ; 2017 All-Star Futures Game MVP: Brent Honeywell ( Tampa Bay Rays) ; October 24 – November 1: 2017 World Series ; The Houston Astros defeated the  Los Angeles Dodgers, 4–3 in games played, to win their first World Series title. 

Question: who won the american league pennant in 2017?
Answer: Houston Astros.
the Houston Astros.