Answer:
(A.) It was the site of a massacre of Lakota Sioux by US troops in 1890.
EDGE2020
 
        
                    
             
        
        
        
The Answer is OD. treaty ending the Second Opium war 
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Beatles--they were the boy next door band bringing British pop to American. Then the band became active in the anti-war movement and their songs turned to protest. 
The Beatles were an innocent "boy band" when first introduced in the US. They sung of love and teenage life. However, by the mid- to late 1960s, the members took on the look of the hippies and began signing protest songs. 
        
             
        
        
        
The very first President of the United States was: George Washington. He was the President from: April 30, 1789 till March 4, 1797.
Hope I helped! 
- Debbie
        
                    
             
        
        
        
The reason behind allowing Labor Unions to form was that collective bargaining guaranteed equality and preserved the continuity of the business, as it secured commerce from "injury, impairment or interruption" and rehabilitates the relation between employer and employee.