The United Mexican States is a federation made up of thirty-one "free and sovereign states". These states constitute one federated State or Union. The federal government has exclusive jurisdiction over the El Distrito Federal, a territory which does not belong to any state but to all, as well as the islands, atolls and reefs that do not belong to any state. The Federal District is coextensive with Mexico City, capital of the federation and seat of government.
Xico is a city in Mexico State, Mexico, located. It serves as the municipal seat of Valle de Chalco Solidaridad municipality, with which it is, for all practical purposes, coterminous. The municipality lies adjacent to the east side of the Federal District (Distrito Federal) and is part of the Mexico City metropolitan area. The city and municipality lie on the old lakebed of Lake Chalco, which was drained like much of the Mexico Basin.