Why is there a split between the USL and MLS?

Why can't the USL and MLS merge and have the USL be MLS's 2nd division? The USL is established in cities that the MLS is not, San Fran, Miami, Puerto Rico, Seattle, etc... Too much pride for the USL, uncertain financial stability? It makes sense... bigger fan bases, more exposure, greater competition, and... show more Why can't the USL and MLS merge and have the USL be MLS's 2nd division? The USL is established in cities that the MLS is not, San Fran, Miami, Puerto Rico, Seattle, etc... Too much pride for the USL, uncertain financial stability? It makes sense... bigger fan bases, more exposure, greater competition, and geographically closer rivalries...
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