Maurya Empire and Gupta Empire are the most significant but there has been more than that.
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Answer:
Unlike earlier Greek theatres that were built into hillsides, the Colosseum is an entirely free-standing structure. It derives its basic exterior and interior architecture from that of two Roman theatres back to back. ... The remainder of the present-day exterior of the Colosseum is in fact the original interior wall.
 
        
             
        
        
        
Yes because they all tried to solve issues with war, economics, and society. The "New Deal" from FDR, the "New Frontier" by JFK, and the "Great Society" by LBJ.
        
             
        
        
        
One of Truman's greatest achievements as president, which utilized the greatest extent of his executive powers, was the racial desegregation of the armed forces. 
        
             
        
        
        
West Virginia is the capital