Major League Baseball rivalries
1967 North American professional basketball
Throughout its history, Major League Baseball has featured numerous rivalries between teams and cities. These rivalries have developed for a variety of reasons, most commonly geographic proximity, frequent competition, specific incidents, cultural, linguistic, national affiliations, and division rivalry.
Background
There were 8 teams in each league and teams in each league played each other 22 times a season. With the second American League incarnation of the Washington Senators (now the Texas Rangers) and the Los Angeles Angels entering play as expansion teams in 1961, MLB increased the total number of games American League teams played to 162, which meant teams would play each other 18 times a season. The National League did not implement this until the following year when the New York Mets and Houston Colt .45s (now the Houston Astros) entered play.
In 1969, with the San Diego Padres, Seattle Pilots, Kansas City Royals, and Montreal Expos entering play as expansion teams, MLB split both leagues into two divisions with six teams each. Teams played a total of 90 intra-divisional games, playing teams within the division 18 times each, and 72 inter-divisional games, playing each team in the other division 12 times. However, in 1977, the addition of the Seattle Mariners and Toronto Blue Jays reduced the number of intra-divisional games American League teams played to 78, as each team would play each team within the division 13 times. However, they still played each team in the other division 12 times, but the total number of inter-divisional games increased to 84. The National League did not institute this until 1993, when the Florida Marlins and Colorado Rockies entered play.
This brief starts where responsible research should: with the source description of “Major League Baseball rivalries” as 1967 North American professional basketball. Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the general reference register because the source frames it as 1967 North American professional basketball. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 1, 2026. The linked authority identifier is Q6738187. The first chronological checks are 1961, 1969, 1977 and 1993.
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This entry incorporates text from “Major League Baseball rivalries” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.