Article 30
Mexican nationality is acquired by birth or by naturalization.
A. The Mexican nationals by birth are:
I. Those born in the Mexican territory, regardless of their parents nationality;
II. Those born in a foreign country of Mexican parents born in national territory, of Mexican father born in national territory, or of Mexican mother born in national territory;
III. Those born in a foreign country of Mexican parents by naturalization, of Mexican father by naturalization, or of Mexican mother by naturalization; and
IV. Those born on board of Mexican military or merchant vessels or aircrafts.
B. The Mexicans by naturalization are:
I. Those aliens who obtain from the Department of Foreign Affairs a naturalization card.
II. Any foreign woman or man who marries a Mexican man or woman and establishes residence inside the Mexican territory, provided that foreigner complies with the other requirements set forth by the law for that purpose.
Oh, and to enjoy full citizenship with rights and obligations
Article 34
Mexican citizens shall be those individuals who are considered as Mexicans and fulfill the following conditions:
I. To be at least 18 years old, and
II. To have an honest way of life.
SAUCE;
http://www.trife.gob.mx/en/consultations/political-constitution-united-mexican-states