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The Constitution of Mexico, formally the Political Constitution of the United Mexican States (Spanish: Constitución Política de los Estados Unidos Mexicanos), is the current constitution of Mexico. It was drafted in Santiago de Querétaro, in the State of Querétaro, by a constitutional convention, during the Mexican Revolution. It was approved by the Constitutional Congress on 5 February 1917. It is the successor to the Constitution of 1857, and earlier Mexican constitutions.
1890- Battle of wounded knee
1876- Battle of little big horn
1869- Transcontinental railroad completed
1865- Civil war ends
1862- the homestead act
1861- telegraph completed
1849- California gold rush begins
To keep all branches from becoming too powerful.