Los Estados Unidos Mexicanos (The United Mexican States) has a national government which is stable.
The government is a democracy. It is a federal republic composed of 31 states and Mexico City (formerly the Federal District). Mexico City is the capital of the federation and has many of the responsibilities of a state, but it is not a state. It is, however, the seat of the federal government and the heart of the country.
Mexico is governed by a Constitution which was approved February 5, 1917. It is the basis for the legal system which is also influenced by legislation, regulations, case law, doctrines, customs, and general principles of law. Mexican law follows the traditions of civil law as opposed to the tradition of common law which is the basis of the legal systems in the US and Canada.
The national government has three branches, which are executive, legislative and judicial. The three branches are independent of each other and create a separation of powers with a system of checks and balances.
The president and his cabinet head the executive branch. The President also is both the head of government and the chief of state. The current President of Mexico is Enrique Peña Nieto who took office on Dec. 1, 2012.
The legislative branch consists of the Camara de Senadores (Senate) and the Camara de Diputados (Chamber of Deputies). There are 128 Senators with 98 elected for 6-year terms and 500 Deputies elected for 3-year terms. Legislators cannot be reelected for the next immediate term.
The judicial branch is composed of the Supreme Court, the Council of the Federal Judiciary, circuit, collegiate, unitary, state and district courts.
State governments in Mexico each have their own constitutions and they are all federal systems with three branches of government. In each state, the head of the executive branch is the governor. The legislative branch is composed of one body (congress) and the judicial branch includes a state supreme court and various local tribunals serve in a single house in each state. The governor and deputies cannot be reelected for the next immediate terms. States are independent and autonomous and the federal government cannot intervene unless there is a severe emergency.
Municipios (municipalities) are the smallest form of government in Mexico. They are headed by an ayuntamiento (municipal council) and a presidente municipal (municipal president) or mayor. The mayor and council members cannot be reelected for the next immediate terms.
El Palacio Nacional en Mexico City
Gary Coles in front of the Antiguo Palacio del Ayuntamiento