The answer is b) Estate stratification. 
This stratification system was a long-run result of feudalism since it fell under the same principles:
1) There's a social hierarchy in which there were a noble class and a peasant class.
2) Only the noble class could have land ownership, and the peasant (or serf) class must work it for the noble's usufruct. 
This system of stratification was upheld not only by illustrated monarchies but also by modern nation-estates (like the U.S.), this is how it received the name of estate stratification.
 
        
             
        
        
        
No problem, hope you got help
        
                    
             
        
        
        
In this milestone decision, the Supreme Court ruled that separating children in public schools on the basis of race was unconstitutional. ... On May 17, 1954, U.S. Supreme Court Justice Earl Warren delivered the unanimous ruling in the landmark civil rights case Brown v. Board of Education of Topeka, Kansas.
 
        
             
        
        
        
While _(The Polish-Lithuanian Commonwealth)_ allowed some freedom of religion in the 1700s, _(Russia)_ attacked and took land away from Poland.
 
        
                    
             
        
        
        
Answer:
Secret 4 is a little different than the oft-repeated slogan, “Those who ignore the past are doomed to repeat it.” Instead, it says that media face the same issues over and over again as technologies change and new people come into the business.The fight between today’s recording companies and file sharers has its roots in the battle between music publishers and the distributors of player piano rolls in the early 1900s. The player piano was one of the first technologies for reproducing musical performances. Piano roll publishers would buy a single copy of a piece of sheet music and hire a skilled pianist to have his or her performance recorded as a series of holes punched in a paper roll. That roll (and the performance) could then be reproduced and sold to anyone who owned a player piano without further payment to the music’s original publisher. 
Explanation: