Final answer:
The Ottoman Empire expanded from 1453-1566 due to a tradition of conquest, the desire of Mehmed II, and geopolitical advantages.
Step-by-step explanation:
The causes of Ottoman expansion from 1453-1566 can be attributed to several factors. Firstly, the Ottoman Empire had a tradition of continuous expansion since its founding, and conquest served to bring new wealth and people into the empire. Secondly, the desire of Mehmed II, the sultan of the Ottoman Empire, to prove his ability played a significant role in the expansion. Additionally, geopolitical advantages and the strategic location of the empire also contributed to its expansion.