*I am not sure about but you may review the following info'(as it is not straight issue):
Saipan is in CNMI.
It has it's own immigration policy though it is US in jurisdiction(Territory).
(There was an amendment proposed in legislation but not sure whether it passed and affective now).
After World War II, the islands became part of the United Nations Trust Territory of the Pacific Islands. In the 1960s residents began to consider the option of becoming either an independent nation or a U.S.-affiliated jurisdiction. The latter sentiment prevailed, and, in 1978, following resident voter approval and U.S. Congressional ratification of the Covenant to Establish a Commonwealth of the Northern Mariana Islands in Political Union with the United States of America, the Northern Mariana Islands became a U.S. Commonwealth. Residents, who subsequently became U.S. citizens, adopted a local government similar to a U.S. state government, the framework of which is set forth in the Commonwealth Constitution .
Most federal statutory law applies in the Commonwealth of the Northern Mariana Islands. Apart from unique customary law based on oral tradition handed down through the centuries, local law is largely based on U.S. common law.
www.justice.gov.mp/2004cacom.aspx.
www.mymarianas.com/html/display.cfm?sid=1021.
*Is Saipan part of the United States?
Good question, with many answers. Here are a few:
Federal Income Taxes No
Social Security Taxes Yes
Federal Labor Law Yes
Federal Minimum Wage No
US Postal Service Yes
FedEx, Airborne, Etc. No
Telephone Yes (effective 1 July 97)
Currency Yes
>>See link:
www.mgnewman.com/saipan/ .
*As per CIS the CNMI may not be a state for them.
Further,as per 8 USC 1102(a)38:
(38) The term “United States”, except as otherwise specifically herein provided, when used in a geographical sense, means the continental United States, Alaska, Hawaii, Puerto Rico, Guam, and the Virgin Islands of the United States.
www4.law.cornell.edu/uscode/ html/uscode08/usc_sup_01_8_10_12_20_I.html .
Also see the following court opinion at item6) under 'Factual back ground'
www.cnmilaw.org/pdf/superior_court/ 00-03-27%20A00-0101.pdf.
*From the above it sounds that living and working in saipan(CNMI)
may not be construed as living and working in US.
*However,as this matter is complex it is best to consult an good standing attorney before taking any decision.
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lay man's opinion only.not a legal advise.