The decline of both the Han Dynasty and the Roman Empire were a slow process. What of these factors was a catalyst for the decline of both these great powers?

political infighting, child emperors, puppets, economic downturn, diseases, and etc,

Explanation:

Decline of Roman empire

-Invasions by Barbarian tribes

-Economic troubles and overreliance on slave labor

-Overexpansion and military overspending

-Government corruption and political instability

Decline of the Han dynasty

-Taxation

-The Yellow Turban Revolt

-Bad rulers

- Decline of imperial power

I hope this helps!

secretly cooperate with one another.

it should definitely consists of the total amount of the entry which hindered the diary of how most conflictions and opinions in the 1800s experiences.