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Which team has never won an American League pennant?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
The Editors of Encyclopaedia Britannica

The Seattle Mariners are the only current American League team to have never won an AL pennant. The Mariners were founded in 1977 and posted losing records until 1991 (an all-time mark for the longest period before a franchise’s first winning season). The Mariners qualified for the playoffs for the first time in 1995 and have made five postseason appearances since. The team is the only current major-league organization to have never played in the World Series.