From 1998 (when the NL West expanded to five teams) to 2012, the AL West was the only MLB division with four teams.

History

When MLB split into divisions for the season, the American League, unlike the National League, split its 12 teams strictly on geography. The six teams located in the Eastern Time Zone were all placed in the AL East, and the remaining six were placed in the AL West.

When the second incarnation of the

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