The Emancipation Proclamation freed slaves living in ten states that were still in rebellion. Slaves that were already in a state that was taken over before the EP were not freed. At the same time, all those freed slaves were enlisted in the Union Army. As a result, after some time black slaves and white citizens of the USA fought together against one enemy. No doubt, the Civil War united black and white people as well as reduced tensions existing among them. The majority of freed black slaves fought rather valiantly and earned the respect of whites. This promoted equality and eradicated some racial prejudices in the society.
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The Supreme Court declared segregation to be uncostitutional in 1954 in Brown v. Board of Education.
One problem was that some states didn't fully understand the meaning for it
I believe this is referring to the Contra groups of Central American nations
