1) he hand picked his solders and made them swear allegiance to him. next he built up imperial house hold to take charge of daily business of government which allowed enslaved people and freedman a choice to join the government. lastly he set up a fire brigade and police force.
2) it brought the trade down because it made romans trade with non romans.
3) because times were different laws had to be changed so they had new laws made.
4) it helped Romans successfully govern a large area.
5) it made few like the Mesopotamia lion and North African Elephant go extinct.
6) They continued Murdering the emperors
7) Since it was too big to rule alone so he split it in half and gave the other half to his friend
8) it fell because there was no Roman empire left and was being ruled by germanic government. next were because Economical, political and foreign reasons.