The advantage for US business in 1800 was that the government sold land at a low cost. The federal government had much land for sale at a rate of 1.25 Dollars per acre. Adjustments were made, and by 1854 the land was sold at an average price of 12.5 cents per acre where more than 2 million acres were sold. Lots of the land had been in the market for over 30 years before the reduction of prices by the federal government.
 
        
                    
             
        
        
        
The Monroe doctrine was the reaction  and effect of the  European powers plan to help Spain create or retake colonies in America. the doctrine, enacted in 1823,pointed out that the USA would intervene to protect the peace and freedom of independent states in the region of America.
        
             
        
        
        
C. Agriculture 
Is what they where most successful in
        
             
        
        
        
The Civilization got it start in China at ~~ The Yellow and Yangtze River Valleys.