What was the significance of the 36˚30´ parallel?

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.

Which of the following two groups did not do battle with the romans? select all that apply.

In 1819, what did the united states obtain from spain for $5 million?