Petroleum is the most important resource found there.
Mexico has been involved in numerous different military conflicts over the years, with most being civil/internal wars.
The answer would be #3
Due to lack of trees to use for building a cabin, many of the prairie homes were made of sod.
School of Athens is Raphael.
La Pieta sculpture is Michelangelo.
Pope Leo X is Raphael
Both for Italian Renaissance.
Cities developed professional firefighting and police forces.