The federal constitution of 1824
On november 7 of 1823 united the constituent congress in the mexico city for discuss above the new form of government.
The  majority of the delegates rejected the  monarchy predominating the idea of create a republic.
Emerged two tendencies: the federalism and the centralism. The federalism wanted a republic in the that  the states were free and sovereigns, focusing in the democracy. The centralism not wanted do changes to the old colonial structure, namely preserve the old status.
The constitution was promulgated on october 4 of 1824 and mexico adopted the system of republican government, representative, popular and federal. Dividing the government in three branches: the legislative, the executive and the judicial.