Answer:
Both developed trade relations with the Maya And the Aztec.
Explanation:
 
        
                    
             
        
        
        
Answer:The American settlers, well at least some of them, seemed to search for any reason as to why the Native Americans could be perceived as a threat. The "Indian Ghost Dance" was a religious movement that the Indians use to spread hope, even though their situation was dismal. The U.S. Army misinterpreted this dance as a WAR DANCE, an assumption which led to the battles of "Wounded Knee" and the "Massacre of Sioux". 
 
        
             
        
        
        
The transportation of goods and people following freely across borders, and the use of the euro.
        
             
        
        
        
These are Portugal and Spain. 
Fun fact: did you know that the border separating those two countries is the oldest on earth (excluding natural borders)? It's been almost the same for around 1000 years (but recently they swapped a little land...)