Why did the abbasids lose control of their empire?

This is when the Abbasid Empire starts to fall apart; heavy taxation, agrarian disorder, societal mishap, and revolts all play the Abbasid Empire into the hands of the Buyids, a Persian group that captures Baghdad, the capital, and controls the Abbasid for a few years. ... The invasion of the Mongols, who sack Baghdad.

Explanation:

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