Famine- High population means more mouths to feed Disease- Diseases usually spread more quickly with people who live closer( as it can just move from one person to the other) War- People like to fight for land, resources, money, etc. And having more of those things mean they are more able to support families, communities, and more.
Larger populations lead to an increase in the demand for resources. Since the resources available do not increase with the increasing population, resources become scarce as there is an increased demand without an increased supply. Famine occurs when there is not adequate food supply for a population, which is directly related to the scarcity of resources that can come about due to a large population. Disease is more likely when large numbers of people are in close proximity and when resources are scarce. The likelihood of war increases as the competition for resources increases as well.
