What was a major reason Constantinople fell to the Ottoman Turks in 1453?

One major reason for the fall of Constantinople to the Ottoman Turks in 1453 was the superior military tactics and technology employed by the Ottomans. Under the leadership of Sultan Mehmed II, the Ottoman Empire had developed a formidable army and navy, including the use of advanced siege artillery, such as cannons. These cannons played a crucial role in breaching the walls of Constantinople, which had long been considered impenetrable.

Furthermore, Mehmed II strategically cut off the city from any external assistance by blocking its access to the sea, using a massive chain across the Golden Horn. This prevented any reinforcements or supplies from reaching the Byzantine defenders, weakening their position significantly.

Another reason was the internal weaknesses and divisions within the Byzantine Empire. Constant conflicts, political intrigues, and power struggles had greatly weakened the empire over the years. By 1453, the empire was reduced to a small area around Constantinople, and its defenses were strained.

Lastly, the Byzantine Empire faced a lack of unity among its Christian allies. Despite appeals for assistance, the Catholic West was divided by religious, political, and territorial rivalries, which prevented a united response to save Constantinople. This lack of unified support left the city isolated and vulnerable to the Ottoman onslaught.