Powerful political idea of the 1800's that upset the balance of power in europe

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.

What is one example of trench warfare ?

All of the following cities are located in china except