How did the united states bring about the allied victory in 1918?

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.

Why hadn’t europeans used maritime routes before the age of exploration?

Known for criticizing the traditional roles of women.