Urban areas often have more complex building codes to handle the denser populations in modern cities.

Pestsov insisted that one nation could assimilate another only if it had a denser population.

"Right now, our densest population is in the northwest part of the state," he said.

"I suppose that they find Earth the best case study, it having the densest population and the longest cultural history."

With food production comes the larger, denser populations and more complex economies than there is among foragers.

Farming permitted far denser populations, which in time organised into states.

And the world's densest population of wizards decided to become involved.

In addition, the denser populations could form and support legions of professional soldiers.

A denser population would also make mass transit more feasible.

Settled areas of denser populations could form urban municipalities with as village, town or city governance.