3. Security factors. If there is any danger of local occurred such as chara to war epidemic. Bandit culprit or natural disasters, evacuation of population migration to the new address, sources, more secure
Three. Safety factor If there are any local hazards happen such as war, riot, crime, epidemics or natural disasters. Inevitably led to population migration to new habitats that provide more secure.
3. The safety factors, if any local have different risks occur, such as an insurgency war, disease, crime, or natural disasters. Makes the population migration to new location to the more