James K Polk is one of the historical figures that is really hard to judge by modern standards.
He was a forceful man with strongly held beliefs. He was the last in the line of "Jacksonian Presidents" with all of the baggage that came along with that.
Ultimately, he was a strong war time President. His single term in office led to the short lived Presidency of Zachary Taylor, who was significantly less informed and forceful than Polk. After Polk, the issue of slavery really came to the forefront. Polk was either responsible for delaying the prominence of this issue or just got lucky. It is likely that history would look much differently if Polk had a second term and continued his aggressive posture towards America's future. 
I'd say he was a good President, for his time, who strongly acted on the economy and in regards to Mexico but whose record looks abysmal by modern standards and values. 
  
        
             
        
        
        
The economic structure of society is based upon division of labour in which the professions and economic activities of people are different or dissimilar. The culture of society prospers with the differences in thoughts ideals, viewpoints, etc. No two individuals are alike in their nature.
        
             
        
        
        
Answer:
Searching for sea root toward Asia
Explanation:
The European explorations were a direct result of the establishing of the Ottoman Empire. The Ottomans had their empire right on the most important place when it came to trade between Europe and Asia, so pretty much everything had to pass through their territory. They used this in order to get a lot of wealth, so they imposed big taxes. That was not seen fondly by the Europeans because they were dependent on the good will of someone else, and plus everything was becoming more expensive and less profitable. In order to find a new sea root toward Asia, they actually managed to discover two new continents by accident, North and South America, thus setting the beginnings of the colonialism.
 
        
                    
             
        
        
        
They believed in the separation of the races.