Answer:
The United States became an imperialist nation at the end of the 19th century because Americans wanted to expand overseas with their belief in manifest destiny.
Explanation:
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Answer:controlling trade with Europe 
Explanation:
I took a test
 
        
             
        
        
        
It is set by multiple levels
        
             
        
        
        
Checks and  balances is the answer to this question. 
        
             
        
        
        
Answer:
John Brown's personal war against slavery had set this process in motion.