Explanation:
First, the Five Good Emperors brought relative peace, stability, and prosperity to Rome. Since they were preceded, then followed by, some pretty ruthless characters, this makes them stand out in the pages of Roman history.
Lack of food recources and other stuff like cultural extermination and yea....
Would it be the Spanish war?
The reason why a democratic government rules within limits set by the citizens is because the citizens elect the people who make the rules--meaning that if someone goes against the interests of the populace they simply won't get elected.
