It promoted it because now they wanted to fight for there county and supported it
<span>The core of the adaptive success characterized by population explosion was the result of: increased food supply
One of the main reason that people have in choosing a place to settle is the resource availability. Areas with largest important natural resources such as foods, water , and land tend to have a larger population compared to the areas that do not.</span>
A job, they left the countryside and migrated to cities and towns for new jobs.
I believe the answer to this could be C.XVII