Ancient Rome 

Like ancient Greece's land, ancient Rome's land was extremely hilly and mountainous which was the cause of their infertile land. What the lacked in resources, in terms of food, Rome made up in  military power. Ancient Rome was able to offer their protection in return for food and other resources. This made them heavily reliant on their naval fleet and trading routes within the Mediterranean. A major opponent was Carthage who was also battling for control over this lucrative body of water. The first Punic war was the first struggle for control which resulted in a military draw. Unfortunately, this reduced Carthage's naval fleet and with desperate need of fertile land sent them on a trip up north for more control. The two players met north of Spain and battled for ultimate control once more. Rome was victorious in this struggle and from this gained access to further fertile land. In conclusion, it is the need for fertile land that caused these two smaller populations of people to grow into enemies by expanding and broadening their horizons. If either of these places had fertile land to start with there would have been no need to expand and learn more about other ways of surviving; using their military force to sustain an environment.