Economic factors is your answer
In this quote, Thurgood Marshall is talking about the time between the signing of the Emancipation Proclamation (which was supposed to free slaves in the Confederacy) to the Brown vs. Board case which ruled that "separate but equal" is unconstitutional.
The reason he brings up these two events is because it shows how little progress American society has changed in these 90 years. Even though African-Americans were supposed to be free citizens after the Emancipation Proclamation, they were still treated as second class citizens in the US. They were constantly targets of voter discrimination, violence, and prejudice.
<span>The main way in which their settlements differed was that the Chavin settled the highlands while the Nazca settled the valleys, which led to different farming techniques. </span>
There are many American writers that are among the pioneers of American realism.
A few of them are:
<span>1)Kate Chopin
</span>2)<span>Edith Wharton
3)</span><span>Willa Carter
</span><span>4)Mark Twain</span>
