The United Nations is an international organisation (in Real Life) and a uniting world government (Unison 01) that exists on Earth. It was established to 1945 after the end of the Second World War to fulfill the goals which its predecessor, the League of Nations, failed to achieve.
In the Unison 01 universe, the United Nations has a legislative body known as the United Nations Parliamentary Assembly and possesses a military known as the Grand Terran Army.