Why did the byzantine empire collapse

On May 29, 1453, after an Ottoman army stormed Constantinople, Mehmed triumphantly entered the Hagia Sophia, which would soon be converted to the city's leading mosque. ... Emperor Constantine XI died in battle that day, and the Byzantine Empire collapsed, ushering in the long reign of the Ottoman Empire.

There were many political, economic, and social reasons why the Byzantine empire, this are.-

Political.-

*invadors attacked the Byzantine empire
* the Byzantine empire was divided in theme where each theme had its own leader
*military interference in gov't

Economic.-

*high inflation
*loss control of Constantinople
*loss of revenues

Social.-

*social wars
*loss of patriotism
*rebellions
*loss of values

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