Challenge: United Kingdom of Aragon and Portugal

The more easy way is make Isabel and Ferdinand never married, years later a king/queen of Aragon married with a King/Queen of Portugal, but, what happen to america in ATL?, Columbus still go to America and discover the continent?, or no one discover America in 1410-1420 and Aragon-Portugal make a mediterranean empire or conquer Indochina?
 
  1. OTL Maria, queen of Sicily, dies young
  2. Maria's OTL husband, Martin of Aragon/Sicily, weds Beatriz, heiress of Portugal in ATL
  3. Martin's uncle, King John I of Aragon, dies without sons as he did in OTL, bringing crown of Aragon to Martin's father
  4. Martin and Beatriz have surviving issue, uniting the crowns of Aragon and Portugal
 
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