Acquiring Mexican Citizenship (naturalization) is an involved process. As a minimum, you must have been living in Mexico for five years with a FM2 visa (some exceptions may apply) and have applied for, and been granted, permanent resident status. Marriage to a Mexican national might enable naturalization without the full five-year residency requirement. Contact an immigration lawyer for advice.
You will be asked to undertake an exam in Spanish, which you must pass in order to acquire naturalization/citizenship. An immigration lawyer will be able to advise you about the exam and what you need to study and research in order to be able to pass it.
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