What is the difference between major league and minor league sports?

1.) Like the major league's counterparts NHL vs AHL, MLB vs MiLB, NBA vs NBA D-League, and MLS vs NASL to the lowest level in united states soccer league system. 2.) What makes the major league more special (examples. the venue arena, atmosphere, fans, fan experience, prestige) or are they both the same as... show more 1.) Like the major league's counterparts NHL vs AHL, MLB vs MiLB, NBA vs NBA D-League, and MLS vs NASL to the lowest level in united states soccer league system.
2.) What makes the major league more special (examples. the venue arena, atmosphere, fans, fan experience, prestige) or are they both the same as their minor league counterparts with minor differences?
3.) Why doesn't the WNBA have their own minor league counterpart? Maybe the use of NCAA basketball?
4.) Lastly, is it possible or makes sense to promote and relegate teams within the leagues listed above to give cities without major league teams the chance to have one?
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