World government is the concept of a single political authority with jurisdiction over all of Earth and humanity. It is conceived in a variety of forms, from tyrannical to democratic, which reflects its wide array of proponents and detractors.
Title page of the 1631 second edition of De jure belli ac pacis
Writing in 1795, Immanuel Kant considered World Citizenship to be a necessary step in establishing world peace.
Einstein, 1947 (aged 68)
International organization
An international organization, also known as an intergovernmental organization or an international institution, is an organization that is established by a treaty or other type of instrument governed by international law and possesses its own legal personality, such as the United Nations, the World Health Organization, International Union for Conservation of Nature, and NATO. International organizations are composed of primarily member states, but may also include other entities, such as other international organizations, firms, and nongovernmental organizations. Additionally, entities may hold observer status. An alternative definition is that an international organization is a stable set of norms and rules meant to govern the behavior of states and other actors in the international system.
The offices of the United Nations in Geneva (Switzerland), which is the city that hosts the highest number of international organizations in the world