Mexico is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the North Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of Mexico.The United Mexican States is a federation comprising thirty-one states and a federal district, the capital Mexico City, whose metropolitan area is one of the world's most populous.
Covering almost 2 million square kilometers, Mexico is the fifth-largest country in the Americas by total area and the 14th largest in the world. With an estimated population of 109 million, it is the 11th most populous country and the most populous Spanish-speaking country in the world.
The United Mexican States are a federation whose government is representative, democratic and republican based on a congressional system according to the 1917 Constitution. The constitution establishes three levels of government: the federal Union, the state governments and the municipal governments. All officials at the three levels are elected by voters through first-past-the-post plurality, proportional representation or are appointed by other elected officials.
Constitutionally, Mexico City, as the capital of the federation and seat of the powers of the Union, is the Federal District, a special political division in Mexico that belongs to the federation as a whole and not to a particular state, and as such, has more limited local rule than the nation's states.