What effect did perestroika have on thesoviet system of government?

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.

How did the phoenicians add to the goods available in their marketplaces?

What do you think was a drawback to this method of calculating distance