There were many effects, but perhaps the most visible one is the Columbian exchange: the  exchange of species, including plant, animal, also diseases such as viruses, on a global scale. 
For example, potato plant was imported to Europe. <span />
        
             
        
        
        
Answer:
industrialization, establishing economic and military control, influencing cultural values, etc.
Explanation:
US motivations and actions during the expansionist period included a variety of policies such as industrialization, establishing economic and military control, influencing cultural values, etc. However, the practice of social Darwinism, which made Americans think that it was their duty to bring cultural enlightenment to underdeveloped nations, was not primarily a good initiative.
Certain aspects like maintaining global peace and economic relationships were great efforts initiated during this period. It greatly attributed to nation building and making US one of the most powerful nation in the world. 
 
        
             
        
        
        
Answer:
There are three main reasons why the Spanish were able to conquer and colonize the Americas: Disease. ... While conquistadors like Hernan Cortes in Mexico and Francisco Pizarro had great weapons and strategies, their greatest ally was disease. Better weaponry.
 
        
             
        
        
        
The correct answer is Head Diplomat.
Many are the roles of a Foreign Policy Leader (also known as a Head Diplomat or Chief Diplomat), such as recognizing the legitimacy of a foreign nation, appointing ambassadors, establishing foreign policies, making treaties, making executive agreements. In the United States, the president is also the Chief Diplomat.