Military invasions is the answer
Answer:
Establish a police constitution
Answer:
The Mongol conquest of the Abbasid Caliphate culminated in the horrific sack of Baghdad that effectively ended the Islamic Golden Age. The Islamic Golden Age—from the 8th to the mid-13th century—was one of the greatest periods of human flourishment in knowledge and progress, with Baghdad as its focal point. But in January 1258, a vast Mongol army reached the city's perimeter and demanded that the caliph—al-Musta'sim, the nominal spiritual authority of the Islamic world—surrender.
Explanation:
the answer is pretty much D. The Mongols attacked Abbasid territory and destroyed its empire.
