when did mexico become a country

Mexico became an independent country in 1821. The Mexican War of Independence lasted from 1810 to 1821, culminating in Mexico's independence from the Spanish Empire with the signing of the Treaty of Córdoba in 1821. Mexico was initially established as the Mexican Empire on September 28, 1821, and later became a federal republic in 1824. The traditional national independence day celebrated in Mexico is September 16, commemorating the start of the independence movement in 1810, but the actual independence was achieved in 1821.