What innovations came
from having cities? How did
life change?

Well there is a good and bad effect! the good effect is that it is much easier and advanced, we now have cars to go to work, and we got computers working. Life became extremely easy and the future is here. By having cities, there is always a home nearby.

Explanation:

yes i think there would be volunteers

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

hope this : )