The MLS, NBA, MLB and NHL are considered mostly as USA leagues but they have teams from Canada. Are there other national leagues (any sport) that are mostly from one country but have teams from other nations?

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    Moderator note: Stack Exchange generally frowns on "list" type questions. I think this one might just about have small enough scope that it can survive - to that aim, I've created a community wiki answer that anyone can edit. Please add more examples to that answer rather than creating your own unless you really feel that it would be important to create your own answer. I will be somewhat harsh in deleting new answers that could be part of the wiki. – Philip Kendall Jul 23 '19 at 11:06

The North American examples certainly aren't unique.

  • I'm not sure I agree that the Estonia-Latvia volleyball league can be called "teams from one country playing in the competition of another country". It appears that league is deliberately designs to be binational, not uninational with additions from elsewhere. – Nij Jul 29 '19 at 9:26

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