Answer:
A divided regional identity (with a bit of national unity) developed.
Explanation:
Politics: Some contributed (voting rights) to unity, others (nullification) clearly divided the country. 
Economics: Market revolution was a bit of both but Tariffs and the clash between the industrial north and the agricultural south was dividing the country and contributed to a regional identity.
Foreign Policy:  The war of 1812 united the country; the westward expansion was uniting and dividing at the same time.
As we take in account that Economics is always the most important thing for the general public, the regional identity grew more than the national unity did.
 
        
             
        
        
        
Answer:
a. 
Spencer and Social Darwinists represent the evolutionary  approach to social change. 
Explanation:
As in nature, the stronger countries and nations prevail and dominate the weaker, which are inferior and not so smart and able as the strong ones, Social Darwinists argue. 
 
        
             
        
        
        
It’s actually 5 points not 10