Write an essay on ‘The united nations functions as a world government’ to what extinct is that statement true?

Harvard citation used. Essay should focus on United nations and International relations theory. Liberal and realist approach of international relations should be discussed but the focus is on the liberal. The institution of the united nations and its history should be mentioned. The functions of the united nations and its role should be mentioned. Examples of conflict / security issues/ human rights/ poverty should be mentioned and discussed. (whether it was a successful case or it wasn’t)The theory should be discussed to support the position. (not a world government necessarily).