USA and the UK are two different conglomerate of states in the world. USA, completely known as United States of America has a federal and constitutional republic form of government while the UK (United Kingdom) instills the constitutional monarchy-parliament governance. In this regard, the head of the state along with the representatives are elected into office by the people in the US. They do their roles as government officials under the code of an already set constitution. Conversely, the UK has its monarch who acts as the head of state and absolute power is not vested unto this monarch because there is usually a duly elected separate head of the government that exercises political powers. These leaders, like in the US, uphold a set of laws in the form of a constitution.