It was known as the Middle Passage                       
        
             
        
        
        
In 1821, the opening of the Santa Fe trail between Santa Fe and 
"Independence, Missouri" led to a reorientation of new mexico's commerce from the rest of mexico to the united states.
Independence is the name of a city in the State of Missouri which is
known to be the fifth largest city of the state. Its population according to
2010 reports was 116,830. It is situated within the Jackson City and it is the
county seat of that.
 
        
                    
             
        
        
        
A national border. Long river.
        
             
        
        
        
The factors in a country that inspire the person to leave home. So, B. is your answer.