The congresses of the federal entities of Mexico are the depositary bodies of the legislative power in the thirty-one states and Mexico City. Conformed as unicameral assemblies, they are composed of deputies elected under the principles of relative majority and by proportional representation, in accordance with the specific regulations of local laws, but following the general bases of the federal constitution. All states, including Mexico City, use the presidential system form of government.
Its members are elected by universal vote under the two principles already mentioned; the former directly and the others according to the multi-member list system established by federal law. The term of office is three years with the option of immediate reelection, as long as it is representing the party or coalition that originally nominated the deputy.
