Why did it begin?
Agrarian Civilization
Civilizations are important. Why? Because The people who were a part of it had advantages. Being able to survive. Yes others could survive also, but what was different about the Civilizations was that they had a lot of food because of Farming not hunting. Farming helped feed the large populations they had. Even having large populations was a good advantage.
Why did it start?
Civilization
The civilizations started because things started becoming more complex. The food we have now is because the Agrarian civilizations farmed. They did this to feed large populations, to survive.
When?
The world and all its different locations.
It comes to say the very first and real civilizations were started about 5,000 years ago. From there they started spreading to different parts of the world.