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National Association of Professional Base Ball Players

Sports league
The National Association of Professional Base Ball Players, often known simply as the National Association, was the first fully-professional sports league in baseball. The NA was founded in 1871 and continued through the 1875 season. Wikipedia
Founded: March 17, 1871
No. of teams: 1871–1875: 9, 11, 9, 8, 13
Sport: Baseball