Political Environment of Mexico

Here are some things you may want to cover in this section.
    What is your countrys form of government?
    Has this always been the form? What other forms did it have?
    How did those changes take place (if applicable)?
    You can choose to give some detail of government structure (branches, etc) but do not get TOO detailed.
    Who has political power? Who are the major players? Are there political parties? How many? Which ones are most powerful?
    What are the major current political issues facing your country?
    How free is the country? Are there political groups who are not free or who have less freedom?
    Basically, this paper is a summary of what do I need to know if I want to start a business in Mexico as an American.