Answer:
The Real Reason: Plain Natives were always on the move, sort of like nomads
What WASN'T the reason: Plains Natives had settlements and never migrated
Explanation:
Plains natives were difficult to defeat because they were always on the move, so the U.S. or Mexican Army couldn't catch up to them. While natives who weren't on the move and had established settlements, were situated in a single place which would allow europeans to raid and destroy their settlement.
so, the wrong reason for why the plains nations were so difficult to defeat would be to say they were a situated settlement and were never migratory or "on the move"
 
        
             
        
        
        
Answer:
In its most basic form it was made to put more power into the the 'common Americans' hands and allowing them to have say in political matters and such.  Which this would be great, if the didn't create it with racial segregation intent. it would help in the sense that there would be a normal American able to talk about some issues from the our prespectives and weigh in on choices made. 
 
        
             
        
        
        
Some factors include: natural resources, immigration, government, entrepreneurs and inventors. It led to rising standard of living, improvement of transportation, and growing populations.
HOPE THIS HELPED!!