Final answer:
The fall of the Akkadian Empire was mainly due to military defeat, combined with economic difficulties and environmental challenges.
Step-by-step explanation:
The fall of the Akkadian Empire can be attributed to military defeat. The empire faced military pressure from the Medes, the Babylonians, and possibly internal civil war. These external and internal conflicts weakened the empire and led to its downfall. The factor that contributed to the fall of the Akkadian Empire is military defeat. Like many ancient empires, the Akkadian Empire faced several challenges that led to its eventual downfall, including external threats and internal strife.
Historically, empires such as the Neo-Assyrian and the Empire of Mali also collapsed due to a variety of factors including military pressure, economic challenges, and environmental changes like drought and famine. For the Akkadian Empire, invasions and rebellions weakened its political structure and undermined its power. This, coupled with other contributing factors like economic difficulties, ultimately led to its disintegration.