Mexico:
The Federal Government of Mexico is the national government of the United Mexican States, the central government established by its constitution to share sovereignty over the republic with the governments of the 32 individual Mexican states. Through the system of separation of powers each of these branches has some authority to act on its own, some authority to regulate the other two branches, and has some of its own authority regulated by the other branches.The executive power is exercised by the executive branch, which is headed by the president and his Cabinet, which, together, are independent of the legislature. Legislative power is vested upon the Congress of the Union, a two-chamber legislature comprising the Senate and the Chamber of Deputies. Judicial power is exercised by the judiciary, consisting of the Supreme Court of Justice of the Nation, the Council of the Federal Judiciary, and the collegiate, unitary, and district tribunals.

Mexico has a multi-party system, which means that there are more than three dominant political parties.Nationally, there are three large political parties that dominate: the PRI (International Revolutionary Party), the PAN (National Action Party), and the PRD (Party of the Democratic Revolution). Other smaller political parties survive in isolation or by forming local coalitions with any of the big three. There are 10 total national parties, 5 local parties, and 6 other parties.All political parties must be registered before the National Electoral Institute (INE), the institution in charge of organizing and overseeing the federal electoral processes, and must obtain at least 2% of votes in the federal elections to keep their registry. Only 8 of the total 21 parties are registered with the IFE as political parties.

The PRI, which seemed to be the largest political party in Mexico, was the beginning of the PRD, which seemed to focus mainly on economic issues when it broke away from the PRI forming its own political party.