What problems might arise from a system of government which entrusts all of the powers to govern in a single leader?
Monty python said it well.
http :// www . montypython . 50webs . com / scripts/Holy_Grail/Scene3.htm
And to put it in boring form: corruption, ineptitude, parochialism, personal bias. Everything you get whenever putting men in charge, without the balance of having them cockfight for or share the position.
That is called central government. There have been a few cultures that got along without a central government.
* The biblical period known as "Judges".
* The tribes living east of the Rhine River, known to Romans as Germanicus.
* The Dutch empire.
* The American colonies up to the publication of "Common Sense" in 1776.
Each example was peaceful, stable, prosperous, crime free, unconquerable in war, and lasted about 150 years. Then the people threw away their accomplishments and demanded a central government. After that they either were conquered or collapsed from within.
So except for those examples, the answer is "all human history."
Here is a free ebook with explanations and examples: comingdarkage.blogspot.com/