Why did the south carolina threaten to leave the union?

Ineed with what i should write for my research paper. my topic is history of slavery. 1800 words. all i need is what to write in each paragraphs. like when the research paper has titles for each paragraph and it explains the tile in each paragraph. for example when did slaverh begin? why did it begin like an outline.

To keep other european powers from threatening its empire in america, spain sent soldiers, settlers, and?

Compare and contrast the civil rights act of 1964 and the civil rights act of 1991