During the French-Indian war (1754-1763) Quebec's natural defense was that it was stationed on a 200-foot cliff overlooking the St. Lawrence River. In the Battle of Quebec, British army scaled the cliffs and defeated French forces.  Quebec was also the oldest French settlement in North America. 
 
        
                    
             
        
        
        
Harry Truman, John F. Kennedy, and Lyndon Johnson
        
                    
             
        
        
        
The answer is a because interchangeable parts made everything be a lot more easy to take apart becuase instead of everything be made of one part they had multiple parts