The population decreased due to the people having to move and relocate
With decentralization, the power is distributed among many people instead of vested in one emperor. This means that each person will have less power overall. In addition, each individual will then try and gain power of their own over each other, weaking the original emperor's influence even more. Hope this helps!
Antonio Romaña was a french mathematician who also served as a christian apologist.
Made it expand and easier