Mexico celebrates Independence Day on September 16, commemorating Father Miguel Hidalgo's 1810 Grito de Dolores—the call to arms against Spanish rule.
1810 = Start of war (Hidalgo's revolt)
1821 = Actual independence achieved (Treaty of Córdoba, Iturbide)
Hidalgo's Grito symbolizes the people's rebellion. Iturbide's victory was elite-driven. The 16th honors the spark, not the settlement.