Answer:
  I think it's b) Central and c) Federalism
Explanation:
I read a article about it
 
        
             
        
        
        
Answer:
The basis for the wealth of Ghana Mali and Songhai was built on gold. 
 
        
             
        
        
        
I'm not sure what your asking but after the vice president the speaker of the house becomes president
        
             
        
        
        
A royal colony is the definition of the answer.
        
             
        
        
        
Companies sell stock so they can raise capital.
So the company can afford new equipment, developing new markets, etc..