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alternatehistory.com
There have been discussions about what if there had not been a Henry the Navigator: https://www.alternatehistory.com/forum/threads/wi-no-henry-the-navigator.345778/
Some argued that this would have hampered the Age of Explorations seriously, while others pointed out that others might have stepped in and fulfilled a similar function in subsidising and aiding maritime explorations, triggering a whole lot of developments that eventually led to the discovery of the Americas.
But what if the nascent age of explorations is even more seriously undermined - say, by Portugal (and the other Iberian kingdoms, too) being caught in costly peninsular wars throughout the 1420s-1450s, i.e. the time in which IOTL caravels are developed, Cape Bojador is circumnavigated, the Pope allows the Portuguese to enslave African heathens etc.?
Would another nation (say, France, or an Italian principality) simply take Portugal`s place and start the age of exploration nonetheless? Can nothing, not even all-out Iberian Wars, stop the commencement of the explorations? Or would there be a delay of decades? Or would something happen that might abort a European Age of Explorations altogether?