Research left-wing domestic extremist groups. What is their core philosophy? What are the pros and cons of this philosophy? Research Muslim extremist terrorism. What are the main tenants of their aims? What should the United States do to prepare for attacks? Research Sovereign Citizens, explain the significance of homemade license plates, bumper sticker that says “Posse Comitatus”, a license plate that reads “E.A.P. III” from the Republic of Pennsylvania and Sovereign Christian Citizen on the borders.