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==Events==
*February 5 – ratification of the [[Federal Constitution of the United Mexican States of 1857]]<ref>Fernandez (2003), p. 85.</ref>
*March 15 - President Comonfort signs the law adopting the [[metric system]]<ref>{{cite web |last1=Morelos Rodríguez |first1=Lucero |title=A peso el kilo. Historia del sistema métrico decimal en México |url=https://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0188-46112009000200011#:~:text=Fue%20en%201861%20mediante%20el,decimal%20de%20pesos%20y%20medidas. |website=Investigaciones geográficas |access-date=16 June 2024 |pages=132–135 |language=es |date=August 2009}}</ref>
*April 1–8 – [[Reform War]]: [[Crabb Massacre]]
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