The United Federation (sometimes shortened to United Fed.) is a country located far west of Arstotzka, bordered by Obristan, Antegria, Republia, and Impor. Entrants from the United Federation are identified by a blue passport with a silver emblem on the front.
As with the other countries, not much background information is given in the game. An ex-inspector on day 18 explains that they used to deny most entrants when they worked at the border in the United Federation, and that the country now uses computers for processing entrants. The game does not provide enough information to compare the statement to the level of technology in other countries.