Why it was so difficult for Mexico to achieve peace and stability?

It was hard because there were many gangs and poverty was great. Also, some of them were slaves. also, all they did was mow lawns anddo physical labor.

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.