What issues were unresolved by the civil war?

The idea of manifest destiny simply stated it was america's destiny to expand from the atlantic ocean to the pacific. the word "destiny" implies an idea that it was within our rights as a nation to expand. in a paragraph of 125+ words, explain what could be wrong with that idea.

What was martin luther king, jr., referencing in the passage that brought him to lead a protest in birmingham?

How was apartheid practiced in south africa