"A world where Constantinople didn't fall into Ottoman Hands"
"The Rise of Constantinople" (1427-1473)
The European Kingdom of Portugal begins its early expansion into the African coast to cope with the decreasing Asian trade routes, The Byzantine Empire is weakened and nearly on the verge of being destroyed by the Ottomans, however, an internal conflict among its commanders led to a conspiracy and the eventual assassination of Murad II and his son Mehmet II, unfortunately for the Ottomans this happened prior to the Second Battle of Kosovo, which cause the mostly disbanded Turkish army (leaderless and disorganized) to be almost wiped out by the almost inferior Wallachian and Hungarian armies. Five years later the Ottoman Empire still faces internal crisis due to the different Caliphs trying to attain the Imperial title. However, they're determined to capture Constantinople to mark the beginning of the new Ottoman Empire. However, Constantine XI Palaiologos has prepared a strong resistance and thanks to its European allies the siege was curtailed and under the Red Moon omen, the City remained undefiled. The Ottomans were force to cede several territories but they remained a powerful menace to the Eastern Empire until 1465, when an Old yet wise Constantinos XI understood that the Empire was gone all that was left now as Constantinople and its surrounding territories, so he decided to dissolve the ancient Empire... his decision was mocked and angrily refuted, he was seen as a mad man. However, who could negate his prowess?.
After the death of Constantinos, the Palaiologos dynasty managed to defend the city against several Ottoman incursions, until 1473 when the unrelentless Turkish enemy fell to its own ambitions, its empire torn apart into several Caliphates and its armies faced each other's in order to regain the Imperial dignity. Meanwhile, the Byzantine Kingdom rises.
"The People from Aztlán" (1492-1508)
Years after the expulsion of the Arabic Caliphates out of Spain, Christopher Columbus gets his small fleet to travel to India (though the necessity isn't urgent since the continuation of Asian trading through Constantinople). In August of 1496 Columbus arrived the Island of "La Española" (current Haiti). However, a disagreement between him and several of his officers sparked a mutiny, which cost Columbus' life and one of his ships. The mutineers arrived on November to the coast where a local tribe convinced them of the presence of many riches on giant city farther west. Two months later this small crew arrived the Great City of Tenochtitlán. These initial "Gods" were tempted by the gold and spices and soon tried to capture the Emperor Moctezuma Xocoyotzin as a hostage, that's when the Mexicas realize these were men - not gods - and instead sacrificed them to the Real Gods. They were forced to teach them about their culture, weapons and those unique creatures they called Horses.
As the Spaniards re-inforced their position in the Caribbean through colonization and slavery, they found out about the descendants from the Legendary Island of Aztlán and their riches, once more tempted by the gold and led by the Conquistador Nicolás de Ovando they attacked the city of Tenochtitlán. However, this time the Mexicas were prepared, equipped with primitives fire weapons as well as cavalry of their own. The battle was fierce and the dead many. However, the worst came through the dissemination of several diseases brought by the Spanish soldiers, causing an epidemic on the Aztec territory. Nevertheless, the Empire still stood, ready to face the white man's invasion and they returned. The First Aztec-Spanish War was nearly starting.
"Some Rise and Some Fall" (1510-1586)
The Byzantines manages to capture several Aegean Islands, while expanding its commercial fleets beyond the Mediterranean and the Black Sea, by creating a port city named "Antallagi" (OTL: Port Fuad) to trade faster Indian products through the Gulf Of Suez. The City of Suez is captured five years later, and several outposts in the Indian route fall under the Kingdom's hands in the following years. In the Ottoman Empire, The Caliph Suleiman I The Magnificent, ends the Civil War and reunites the Caliphates once again under the Imperial Flag. However, much of its external territories have been lost to neighboring kingdoms and Suleiman himself The is assassinated a few years later by several conspirators (believed to be funded by the Byzantines themselves).
In America, the Portuguese begin its colonization of the Brazil territories, while the Mexicas begin trading with the Dutch (resources for weapons) while the Second Aztec-Spaniard War begins (resulting in Spanish defeat. However, they captured the nearby coastal area) a few years later the Third Aztec-Spaniard War is fought and finished once again in Spanish defeat (the natives reclaimed the Coastal Area and expelled the Europeans back to La Española). The Spanish realm is economically ruined. Deprived of its American rights and Dutch northern possessions, concentrates its last resources on the Caribbean. In the Holy Roman Empire, The Emperor Charles V retires, leaving an Empire fractured by religious conflicts. However its successors realizing the Spanish decline seize the opportunity and sent a colonist expedition to settle in the Silberach River (OTL: Rio de la Plata) establishing the City of Großaue (OTL: Buenos Aires). Years later, the Emperor created the Imperiale Kolonie of Silberach on this spot to prevent the Portuguese advance while a series of colonization waves started to arrive from The Holy Roman Empire, sent under the promises of new lands and rights upon them.
"The Modern States" (1601-1700)
The Byzantine creates its West Trading Company with local aristocrats and Venetian bourgeois, in order to monopolize the commerce in the West Indies, soon it manages to create outposts in the Indian, the Sultanate of Aceh and Japan territories, creating common embassies with them. However, conflict arises with other european nations as they fought for the same commercial rights. The Basileus realizing the potential of the Bourgeois and the educated non nobility, begin creating a State more and more independent from the traditional Nobility, creating the first modern State-endorsed Army. In America, The Aztec Empire finishes its semi-Isolationist stance after the Prince Tlatelolco II visited Europe and reoriented the State to pursuit a more merchantilistic approach, creating several new State's secretaries its first merchant fleet. During this expansion, the empire reachs the Tawantinsuyu and begins diplomatic and commercial relationships with them, entering the Inkas into the modern world and technologies; in time, the Tawantinsuyu will expand its territories into the North and East, clashing with the Dutch/Spanish and the Kingdom of Portugal respectively and creating new cities devoted to exploit minerals and to trade more effectively in the Atlantic.
In the Southern Region of America, the Imperial Kolonie, expands itself helped by european immigration and the integration of some the local tribes into the commercial scheme, while trading with the Inkas. In Brazil, the sugarcane culture, grown in the engenhos (factories) along the northeast coast became the base of Brazilian economy and society, with the use of black slaves on large plantations to make sugar production for export to Europe; occupation on the continental territories continues as the French and Dutch tries to occupies several places in the Portuguese territories. In the northern America, the United Kingdom begins its colonization of the Virginia territories.