can undocumented immigrant apply US pension?

Dear Khun Seng,
It is really a matter of concern as the immigration protocols are pretty stringent here in Thailand.
Furthermore, undocumented immigrants in Thailand, or anywhere else, typically do not have legal status to apply for U.S. Social Security benefits or pensions. To be eligible for U.S. Social Security benefits, including retirement pensions, a person generally needs to have earned enough "credits" through working in the United States legally and paying Social Security taxes.
Undocumented immigrants typically work "off the books" or under the table, which means they do not have a legal work history in the U.S. and do not pay Social Security taxes. Without a legal work history and a valid Social Security number, they would not be eligible to receive Social Security benefits.
However, if you feel that your application for immigration can help you get the pension, we can surely help you with that. But for that, You may visit our profile, Once our team receives the complete information, we will process your request and do the needful to help you out of the situation.
Expecting to hear back from you via email,
Best Regards
Tanet Prasong
Foreign Advisor and Consultant - Konrad Legal Company Limited