Central government or the national government (or, in federal states, the federal government) is the government at the level of the nation-state. A federation ( Latin: foedus, covenant is a union comprising a number of partially self-governing states or regions united by a central ("federal" For the government of parliamentary systems see Executive (government. For the online game see Jennifer Government NationStates. The nation-state is a certain form of State that derives its legitimacy Maintaining national security and exercising international diplomacy (including the right to sign binding treaties) are usually the responsibilities of this level of government. National security is the entire scope of measures undertaken by the Governments of Nation-states in providing assurance of national Sovereignty Diplomacy is the art and practice of conducting Negotiations between representatives of groups or states A Treaty is an agreement under International law entered into by actors in international law namely States and International organizations. Basically, the central government has the power to make laws for the whole country