From what I am reading, my wife can continue to keep her Thai Passort even if she becomes a citizen of U.S. I really want to ensure that this won't be a problem since I do no want her to lose any rights such as the purchase of land or home in Thailand even though is a U.S citizen. Also, what is the advantage/disadvantage of just going the green card route.

Thailand does allow dual nationality, and taking out same will have no effect on her rights as a Thai citizen. The only problem would be if the US insist on her renouncing her Thai citizenship before granting her US citizenship. The UK also allows dual nationality, but does the US?

Bit of Info......Uncle Sam dosnt LIKE the idea but he wont object....

Which Countries Allow/Prohibit Dual Citizenship?

Countries Which Allow Dual Citizenship:

Bangladesh, Brazil, Canada, Colombia, Cyprus, Egypt, El Salvador, Federal Republic of Yugoslavia, France, Greece, Hungary, Ireland, Israel, Italy, Jordan, Latvia, Lebanon, Lithuania, Macedonia, Malta, Mexico, New Zealand, Pakistan*, Portugal, Serbia and Montenegro, South Africa*, Spain (only in certain cases), Sweden, Switzerland, Syria, Tonga (only in certain cases), Turkey, United Kingdom, United States of America, Western Samoa.

* Persons retain their former citizenship if they apply to retain it before taking out Australian citizenship.

Countries Which Prohibit Dual Citizenship:

Austria, Belgium, Brunei, Burma, Chile, China, Denmark, Ecuador, Fiji, Finland, Germany, Iceland, India, Indonesia, Iran*, Japan, Kenya, Kiribati, Korea, Malaysia, Mauritius, Nepal, Norway, Papua New Guinea, Peru, Philippines, Poland, Romania, Singapore, Solomon Islands, Thailand, Venezuela, Vietnam, Zimbabwe.

* Iran does not recognise dual citizenship but continues to recognise its citizens as Iranian.

* Note that Germany has recently amended its citizenship laws so that in some exceptional circumstances, dual citizenship is now allowed. Consult the German Foreign Office website for details.

* Also, India announced on 8 January 2002 that it will shortly change its law to allow dual citizenship for Indians settled outside India.

This information was taken from Attachments A and B of the Government's June 2001 Discussion Paper with updates that we have become aware of since then. Please note however that laws may change in some countries and we cannot guarantee that this list is completely up to date.

from US Citizenship...

Bit of Info......Uncle Sam dosnt LIKE the idea but he wont object....

Which Countries Allow/Prohibit Dual Citizenship?

Countries Which Allow Dual Citizenship:

Bangladesh, Brazil, Canada, Colombia, Cyprus, Egypt, El Salvador, Federal Republic of Yugoslavia, France, Greece, Hungary, Ireland, Israel, Italy, Jordan, Latvia, Lebanon, Lithuania, Macedonia, Malta, Mexico, New Zealand, Pakistan*, Portugal, Serbia and Montenegro, South Africa*, Spain (only in certain cases), Sweden, Switzerland, Syria, Tonga (only in certain cases), Turkey, United Kingdom, United States of America, Western Samoa.

* Persons retain their former citizenship if they apply to retain it before taking out Australian citizenship.

Countries Which Prohibit Dual Citizenship:

Austria, Belgium, Brunei, Burma, Chile, China, Denmark, Ecuador, Fiji, Finland, Germany, Iceland, India, Indonesia, Iran*, Japan, Kenya, Kiribati, Korea, Malaysia, Mauritius, Nepal, Norway, Papua New Guinea, Peru, Philippines, Poland, Romania, Singapore, Solomon Islands, Thailand, Venezuela, Vietnam, Zimbabwe.

* Iran does not recognise dual citizenship but continues to recognise its citizens as Iranian.

* Note that Germany has recently amended its citizenship laws so that in some exceptional circumstances, dual citizenship is now allowed. Consult the German Foreign Office website for details.

* Also, India announced on 8 January 2002 that it will shortly change its law to allow dual citizenship for Indians settled outside India.

This information was taken from Attachments A and B of the Government's June 2001 Discussion Paper with updates that we have become aware of since then. Please note however that laws may change in some countries and we cannot guarantee that this list is completely up to date.

from US Citizenship...

always 2 sides 2 it....

I this has been explored a few times on Thai Visa. The basic finding was that while the US in principal does not like it, it doesn't stop people from holding both US and another nationailty.

I personally know half a dozen Thai/US nationals. Some obtained by birth in the US, others via naturalisation. In both cases there has never been an issue holding both, so long as that person enters the US on the US passport (which is the law).

Countries Which Prohibit Dual Citizenship:

....Thailand.......

This information was taken from Attachments A and B of the Government's June 2001 Discussion Paper with updates that we have become aware of since then. Please note however that laws may change in some countries and we cannot guarantee that this list is completely up to date.

Definitely out of date as far as Thailand is concerned. Thailand has allowed dual citizenship for at least the last 10 years.