B) Its territory was too vast to defend
hope this helps
        
             
        
        
        
Precious gems would be my best guess, it's the only natural rescource that's only in one area. Sooo.... Precious gems i guess
        
                    
             
        
        
        
The most abundant fossil fuel is coal... Coal isn't only our most abundant fossil fuel,it's also the one with perhaps the longest history. The U.S. has more coal reserves than any other country in the world. In fact, one-fourth of the all the known coal in the world is in the U.S.
        
                    
             
        
        
        
Answer:
there are multiple reasons as to why death rates decrease 
Environmental interventions.
improvement in nutrients.
Advances in medical medicine  
advanced access to health care.
upgrades in surveillance and monitoring disease.
are just a few :)
Explanation: