What elements of their society helped the Mongols succeed in taking over other civilizations?

Mongols were a homogeneous society committed to further the goals of the Mongol society themselves.

Explanation:

Although the Mongols before Ghenghis Khan were scattered as nomads they mostly had a homogeneous set of languages they all spoke and understood and had the same religious practices that had been passed down tot hem for centuries.

This allowed for a sort of loyalty to the Mongol race and the furtherance of the mongol cause when taking over other parts of the world.

As the Mongol religion required them to be tied to their land, they had a strong sense of belonging as a group that fights together to survive to become one of the great conquerors of all time.

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.