I think it would be A End of the Cold War.
Hope I helped!
        
             
        
        
        
Answer:
explicit                          
Explanation:
Explicit knowledge: Explicit knowledge is also referred to as expressive knowledge. It is defined as the knowledge that is being willingly articulated, stored, codified, and accessed and can easily be transferred from one person to another. An apprehender's explicit knowledge can be made explicit through the verbal statement.
In the question above, the information Caroline acquired is an example of explicit knowledge. 
 
        
             
        
        
        
If i'm not mistaken, the European Union practices a Federal government structure :)
        
                    
             
        
        
        
<h2>The Answer Is:</h2><h3><u>B</u><u>:</u><u>Congress could not decide whether to allow slavery in the territories</u></h3>