Respuesta :
The current flag was adopted in 1968, but the overall design has been used since 1821, when the First National Flag was created. The current law of national symbols, Law on the National Arms, Flag, and Anthem, that governs the use of the national flag has been in place since 1984.
The Flag of Mexico, as it is today, was adopted in 1968. But Mexican flag history really goes back over 600 years earlier than that.
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