What did European traders offer to African kings and merchants in exchange for slaves?​

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.

The mongols were descendants of a. pastoral nomadic tribes b. tibetan tribes c. shang nobility

What is the term of the negotiated that recognized both british and american claims in the northwest? joint controljoint occupationjoint mandatejoint agreement