<span> bureaucracy, Hope that helped
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The most important reason was economical: slavery was profitable for slave owners in the South, and they were against its abolishing. The southern plantations were very work -intensive, so a lot of work was needed and slave labour was a very cheap source of labour that the owners didn't want to give up upon. 
the correct answer is <span>B. The Southern plantation economy depended on slavery. </span> 
        
                    
             
        
        
        
In total, the Black Death has killed about 450 million down to 350-370 million in the 14th century. 
Hope that helped! :)
        
                    
             
        
        
        
Answer:
The main reason the US joined WWII was because of the attack on the pearl harbor base in Hawaii.
Explanation:
Hope that helps!