Events in the year 1821 in Mexico.

• Regent-Agustín de Iturbide

• February 24 – Army of the Three Guarantees formed
• August 24 – Mexico gains its independence from Spain from ratifying the Treaty of Córdoba.
• September 28 – The Declaration of Independence of the Mexican Empire is ratified.
• September 29 – Agustín de Iturbide is proclaimed as the President of the Regency.

• Maria Fermina Rivera, Heroine of Mexican War of Independence (exact date unknown)

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