A larger US electoral map

What would a larger US electoral map look like and how does this effect the evolution of parties? Would there be more parties founded as the number of states climb pass 50?
 
Pray explain. Are you asking about a US with more than 50 states in its current surface area or extended beyond its OTL borders. If the latter, we'd need to what you envisage to even begin to ponder the question
 
What would a larger US electoral map look like and how does this effect the evolution of parties? Would there be more parties founded as the number of states climb pass 50?

More land? What land? Some/all of OTL Canada? Part/all of Mexico? Cuba, Bahamas, Puerto Rico? Haiti & the Dominican Republic? What's your POD? Knowing the answers to these questions would help shape & inform the discussion.
 
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