Here is an AI generated alternative history mod for EU4

[Comrade Maethor]

I gave ChatGPT this prompt: "Create an alternative history of Europe in which the Crusade of Varna was successful"

And here is the response:
"The Crusade's Triumph: The Crusade of Varna, led by a coalition of European powers, decisively defeated the Ottoman forces in the Battle of Varna. The Ottoman Sultan Murad II was captured, and the remnants of his army were forced to retreat.

Ottoman Fragmentation: With the Sultan in captivity, the Ottoman Empire plunged into a power struggle for succession. This internal turmoil weakened their ability to respond effectively, allowing the Crusaders to capitalize on their victory.

European Expansion: Buoyed by their success in Varna, the Crusaders launched subsequent campaigns against the Ottomans, pushing deep into their territories. The European powers formed a unified front against the weakened Ottoman Empire, gradually reclaiming lost lands and expanding their own spheres of influence.

Ottoman Partition: The Ottoman Empire faced a similar fate to that of the Byzantine Empire centuries earlier. European powers partitioned the Ottoman territories among themselves, establishing colonies and protectorates across the conquered lands. This led to the emergence of a new balance of power in Europe.

Renaissance Flourishes: The Renaissance, already underway, gained even greater momentum in this alternate history. The influx of wealth and cultural exchange resulting from the successful Crusade of Varna fueled artistic, scientific, and intellectual advancements throughout Europe. This era became known as the "Varnan Renaissance."

Exploration and Trade: With the new territories under European control, explorers set sail to further expand their dominions. European powers established trade routes, reaching far-flung regions and establishing colonies in Africa, Asia, and the Americas. The balance of power shifted further in favor of Europe, with wealth pouring in from these ventures.

Religious and Political Transformations: The successful Crusade of Varna not only weakened the Ottoman Empire but also reshaped the religious and political landscape of Europe. The Catholic Church experienced renewed vigor and influence as Christianity gained ground. The Reformation, led by Martin Luther, emerged differently, as the Catholic Church sought to maintain its dominance in this alternate reality.

Scientific and Technological Advancements: The Varnan Renaissance propelled scientific discoveries and technological advancements. European scholars made significant strides in various fields, including astronomy, mathematics, medicine, and engineering. These advancements, combined with the exploration and colonization efforts, accelerated Europe's dominance in the world.

Global Influence: Europe's expanded territories, vast wealth, and technological advancements allowed it to assert greater influence on the global stage. European powers exerted control over colonies and trade routes, shaping the development of nations and civilizations worldwide.

Unforeseen Consequences: While the successful Crusade of Varna brought about European dominance and progress, it also led to conflicts and tensions within and beyond the continent. Rivalries between European powers intensified, leading to new conflicts and wars as they vied for control over the spoils of their conquests.

In this alternative history, the successful Crusade of Varna reshaped Europe's destiny. European powers expanded their territories, enjoyed a flourishing Renaissance, and dominated global affairs. However, the consequences of this triumph created a new set of challenges and conflicts that shaped the subsequent centuries."

[RCMidas]

In other words, nothing especially changed barring the effective expansion of the HRE into the Balkans and Anatolia. The most interesting hypothesis to pursue from here would be "what happens in Ethiopia and Persia without the Turks interfering this time around?"

Portuguese mercenaries in Ethiopia without opposing Ottoman forces aiding Adal would likely mean a much stronger and more unified Horn of Africa, whilst Persia would probably be able to unify much of Mesopotamia and Central Asia and contest the growing power of the Mughals to their east, squeezing them against the Indian kingdoms.

[Nitrate Dioxide]

Who spearheads this exploration, if it even happens?
The Mans aren't here to block trade to India and China, so Portugal and Spain have no need to round the cape. Or go west in an attempt to reach India, because what they're searching for is readily accessible.

It seems like the AI isn't very good at "What ifs" as it's only really trained on what *happened*

[RCMidas]

Columbus' expedition was still, hypothetically, intended on finding a cheaper and quicker way than the land route to India. They just messed up the calculations as to the actual size of the Earth.

Besides, as demonstrated by Magellan a little later, it isn't the practicality of the expedition: it is the glory associated with it.