After doing some research i have come across the following information
which i hope can help you.
gives information on the state of dual citizenship.
"The concept of dual nationality means that a person is a citizen of
two countries at the same time. Each country has its own citizenship
laws based on its own policy.Persons may have dual nationality by
automatic operation of different laws rather than by choice. For
example, a child born in a foreign country to U.S. citizen parents may
be both a U.S. citizen and a citizen of the country of birth.
A U.S. citizen may acquire foreign citizenship by marriage, or a
person naturalized as a U.S. citizen may not lose the citizenship of
the country of birth.U.S. law does not mention dual nationality or
require a person to choose one citizenship or another. Also, a person
who is automatically granted another citizenship does not risk losing
U.S. citizenship. However, a person who acquires a foreign citizenship
by applying for it may lose U.S. citizenship. In order to lose U.S.
citizenship, the law requires that the person must apply for the
foreign citizenship voluntarily, by free choice, and with the
intention to give up U.S. citizenship.
Intent can be shown by the person's statements or conduct.The U.S.
Government recognizes that dual nationality exists but does not
encourage it as a matter of policy because of the problems it may
cause. Claims of other countries on dual national U.S. citizens may
conflict with U.S. law, and dual nationality may limit U.S. Government
efforts to assist citizens abroad. The country where a dual national
is located generally has a stronger claim to that person's allegiance.
However, dual nationals owe allegiance to both the United States and
the foreign country. They are required to obey the laws of both
countries. Either country has the right to enforce its laws,
particularly if the person later travels there.Most U.S. citizens,
including dual nationals, must use a U.S. passport to enter and leave
the United States. Dual nationals may also be required by the foreign
country to use its passport to enter and leave that country. Use of
the foreign passport does not endanger U.S. citizenship. Most
countries permit a person to renounce or otherwise lose citizenship.
Information on losing foreign citizenship can be obtained from the
foreign country's embassy and consulates in the United States.
Americans can renounce U.S. citizenship in the proper form at U.S.
embassies and consulates abroad."
If you wish to call someone from the USA about dual citizenship and
its risks you may be able to speak to someone in the know from one of
these telephone numbers.
Primarily "Latin America and the Caribbean Division at (202) 647-5118;"
"Counsel representing persons in matters related to loss of U.S.
nationality may also address inquiries to Director, Office of Policy
Review and Inter-Agency Liaison, Overseas Citizens Services, Room 4817
N.S., Department of State, 2201 C Street N.W., Washington, D.C. 20520,
This page gives information on loss of american citizenship if you
claim a dual nationality.
Dual nationality can occur as the result of a variety of
circumstances. The automatic acquisition or retention of a foreign
nationality, acquired, for example, by birth in a foreign country or
through an alien parent, does not affect U.S. citizenship. It is
prudent, however, to check with authorities of the other country to
see if dual nationality is permissible under local law. Dual
nationality can also occur when a person is naturalized in a foreign
state without intending to relinquish U.S. nationality and is
thereafter found not to have lost U.S. citizenship the individual
consequently may possess dual nationality. While recognizing the
existence of dual nationality and permitting Americans to have other
nationalities, the U.S. Government does not endorse dual nationality
as a matter of policy because of the problems which it may cause.
Claims of other countries upon dual-national U.S. citizens often place
them in situations where their obligation to one country are in
conflict with the laws of the other. In addition, their dual
nationality may hamper efforts to provide U.S. diplomatic and consular
protection to them when they are abroad."
This website is the american consulate in Mexico (ciudad juarez) and
may have information about dual citizenship and how to obtain it. You
can contact them on the following phone numbers.
Phone: (656) 611-3000
(This phone number is NOT for visa information)
If calling from the U.S. dial 011-52 before the number
Immigrant Visas From the U.S: 1-900-476-1212
Unfortunately i do no speak Spanish so i am unable to understand this
website however i believe that it would be able to give you the
information regarding obtaining citzenship based on grandparents.
*IT IS IN SPANISH*
This page has information on the requirements of obtaining a mexican passport.
The following page has the following information
"Can I be granted Mexican Citizenship?
Acquiring Mexican Citizenship is an involved process, and it is not
easy to do. As a minimum, you must have been living in Mexico for 5
years (2 years under special circumstances) and have resident status.
Marriage to a Mexican national may allow Citizenship without the
residency requirement. For matters concerning the acquisition of
Mexican Citizenship, seek professional advice and contact your local
A list of Mexican Consulates in the USA and Canada is available here.
You will be able to call your local consulate and speak to them
directly about how to obtain the Dual citizenship or become a full
I hope this helps, if i can be of any further assistance do not
hesitate to to leave a comment.