The organization of the American Government
You can introduce from the history of the government. How and why the government was set up?
Focus on “the separation of the three powers” in which how the president, congress and supreme court work together and restrict each other. If you can, please list a brief outline for that paper, so I can check if there is anything not appropriate. This is giant topic and you have to observe deeply.
AT LEAST 6 REFERENCES!