In the early 23rd Century Earth is a relatively peaceful place. Since the 4th and 5th World Wars of the 22nd Century, Earth relies on its Grand Council, headed up by the President of the Earth, to coordinate the still separate 44 countries that are spread across the 4 Concatanates (Cadabra, G-Soft, Malachite, and Sino-Soviatek) that divide Earth’s population.
The Grand Council came into being as both of the World Wars really ended in stalemate and at a time when it began to be clear that the people of Earth were not alone in the galaxy. This realisation made some coordination of the 4 Concatanates, essential.
The existence of a President of the Earth is however largely symbolic and the President and Council are really only significant when there is an alien incursion or war that needs to be dealt with or when the constant ‘skullduggery’ of the 4 Concatanates sails too close to the edge of armed conflict on Earth.