H-2A temporary agricultural workers: Depends on the validity period of the labor certification and the proposed period of employment, plus ten days before the beginning of the approved H-2A petition and 30 days following the expiration of the approved petition. Initial maximum of 12 months, with extensions of up to a year possible, limited by an overall maximum of three years.
I would say a tourist visa (6 month) is best because a fiance visa limits your time and is not one that can be renewed like a tourist visa. You can renew a tourist visa for 6 months. It does not always get approved but it is something that is possible with the tourist and not with the fiance visa. Now if you plan on getting married as stated in the fiance visa then in…
H-1B temporary workers in specialty occupations and distinguished fashion models: Depends on the validity period of the labor condition application and the proposed period of employment, plus a period of up to ten days before the validity period of the H-1B petition begins and ten days after it ends. Most H-1B workers are initially granted up to a three-year stay. Extensions are allowed up to a maximum total stay of six years (with exceptions, notably for persons who are seeking permanent residence through the job). After getting your H-1B, any time you spend outside the U.S. is added on to and extends your three years.
On what basis would she be able to adjust status once in the U.S.? Of course she shouldn't do this. If immigration officials even *think she entered the U.S. on a tourist visa with the intention of immigrating, she'll never adjust status. It's never advisable to enter the U.S. on a tourist visa with the intent of immigrating. http://www.dixonimmigration.com/index.php?pid=2
The United States is an open society. Unlike many other countries, the United States does not impose internal controls on most visitors, such as registration with local authorities. Our immigration law requires consular officers to view every visa applicant as an intending immigrant until the applicant proves otherwise. In order to enjoy the privilege of unencumbered travel in the United States, you have a responsibility to prove you are going to return abroad before a visitor or student visa is issued.
If you are planning urgent travel to the United States, you will need to contact our helpline informing that you have urgent need for your passport and request for an update of your visa application. You will have to wait for the response from the Embassy/Consulate. When your passport/document is returned to you, it will be delivered to the document delivery address you have provided at the time of appointment scheduling.

^ Brown, Theresa Cardinal (9 May 2016). "Biometric Entry-Exit Update: CBP Developing Land Border Process". Bipartisan Policy Center. Retrieved 25 April 2019. While a requirement for a biometric entry-exit system has been in law for over a decade, it is not yet a reality. Many reasons for the long gestating development have been documented in BPC’s 2014 report Entry-Exit System: Progress, Challenges, and Outlook, including the technological, operational, and cost challenges of creating exit systems and infrastructure where none exist today. However, many critics, especially in Congress, simply accused the Department of Homeland security of dragging its feet... the major operational, logistical, and technical challenge in implementing exit capability at our ports has been the land borders. Unlike airports and seaports, the land border environment is not physically controlled, there is no means to get advance information on who is arriving, and the sheer volume of travel—both vehicular and pedestrian—creates challenges in any system to not further exacerbate delays. While biometric exit for land vehicular traffic is still in the “what if” stage, CBP is moving ahead and piloting systems and technology to use with the large population of pedestrian crossers at the U.S.-Mexico border.
If Customs and Border Protection (CBP) authorizes your admission to the United States at the designated port of entry, you will receive a stamped Form I-94, Record of Arrival-Departure. If you wish to stay beyond the time indicated on the Form I-94, you may apply for an extension by filing Form I-539, Application to Extend/Change Nonimmigrant Status, with USCIS.

The United States of America does not require exit visas. Since October 1, 2007, however, the U.S. government requires all foreign and U.S. nationals departing the United States by air to hold a valid passport (or certain specific passport-replacing documents). Even though travellers might not require a passport to enter a certain country, they will require a valid passport booklet (booklet only, U.S. Passport Card not accepted) to depart the United States in order to satisfy the U.S. immigration authorities.[113] Exemptions to this requirement to hold a valid passport include:
The following table lists visa policies of all countries by the number of foreign nationalities that may enter that country for tourism without a visa or by obtaining a visa on arrival with normal passport. It also notes countries that issue electronic visas to certain nationalities. Symbol "+" indicates a country that limits the visa-free regime negatively by only listing nationals who require a visa, thus the number represents the number of UN member states reduced by the number of nationals who require a visa and "+" stands for all possible non-UN member state nationals that might also not require a visa. "N/A" indicates countries that have contradictory information on its official websites or information supplied by the Government to IATA. Some countries that allow visa on arrival do so only at a limited number of entry points. Some countries such as the European Union member states have a qualitatively different visa regime between each other as it also includes freedom of movement.
This document may be denied for any number of reasons. People with certain infectious diseases, for example, may be told to seek treatment for those diseases before a visa will be issued. They may also be denied to people who could potentially strain the system of the country they are visiting: for example, someone without enough money to get by might be denied a visa out of concern that he or she could rely on public assistance for help.

Children travelling with adults who are not their legal guardians and/or who are travelling with one parent rather than both parents are advised to bring a signed letter from the legal guardian(s) indicating that permission has been granted to leave their country of citizenship and enter the USA. If a single parent has sole custody, it's advisable to bring a court custody document to substantiate this.


To travel to the US visa-free, you must have valid ESTA authorization. Once granted, ESTA is usually valid for a period of two years from the date of issuance. During this time, you can make mutiple trips to the US, provided you remain ESTA-eligibile and provided you reason for travel is permissible under the visa waiver program. If your passport expires prior to the two-year point, your ESTA status will no longer be valid. 
In accordance with the agreement signed between the United States and China to extend visa validity, beginning on November 29, 2016, Chinese citizens with 10-year B1, B2 or B1/B2 visas in Peoples’ Republic of China passports will be required to update their biographical and other information from their visa application via a website every two years, or upon getting a new passport or B1, B2, or B1/B2 visa, whichever occurs first.  This mechanism is called EVUS - Electronic Visa Update System.
Citizens of member states of the Association of Southeast Asian Nations do not require tourist visas to visit another member state, with the exception of Myanmar. Until 2009, Burmese citizens were required to have visas to enter all other ASEAN countries. Following the implementation of visa exemption agreements with the other ASEAN countries, in 2016 Burmese citizens are only required to have visas to enter Malaysia and Singapore. Myanmar and Singapore had agreed on a visa exemption scheme set to be implemented on 1 December 2016.[88] ASEAN citizens are entitled to use the Burmese visa on arrival facility.
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