Their knowledge allowed them to take control of the production process and the training of apprentices.
 
        
             
        
        
        
 George McClellan was the general fired by Abraham Lincoln on November 2,1861
        
             
        
        
        
Country borders do not relect cultural groups
        
             
        
        
        
Answer:
D
Explanation: 
All of the answer are important to maintain network
        
                    
             
        
        
        
United Kingdom/Great Britain