You should do one of the following before the December date, which I believe is stamped or written in your passport:
- Have your entry corrected. You have been admitted under the visa waiver program, but you should not, because you have a B-2 visa.
- leave and return to the US.
If you are entering the US with a visa in the future, open your passport on the visa page before handing it over to the immigration officer. This reduces the likelihood of a wrong approval record.
To have your entry corrected, you can introduce yourself to a delayed checkpoint. These websites are intended for persons who (among other things) believe that the documents issued in the port of entry and the corresponding endorsements require a review and possible correction:
The on-site staff for the late-time inspection is also available to review and issue the required documents to correct the errors arising from the entry documents issued on entry into the United States relating to an incorrect classification of non-immigrants, inaccurate biographical information or an incorrect approval period are appropriate. Any designated later inspection site or CBP office at an international airport should be able to help you, no matter where the actual document was issued.
Travelers are encouraged to contact locations outside an international airport as needed to make an appointment. In many cases, the location of your final destination, where the discrepancy is resolved, may not be the port of your first arrival in the US. Mail-in procedures are usually not available.
The delayed inspection bodies correct only errors made at the time of entry. You must contact the US Department of Citizenship and Immigration (USCIS) if you: wish to replace a lost, stolen or mutilated landing permission for crew members, CBP Form I-95; apply for an extension of your stay in the US; or change your immigration status. Specific information can be found on the USCIS website.
If you opt instead for a short trip to Canada, Mexico or the Caribbean, you should explicitly tell the official that you have been admitted to the VWP even though you have a valid visa. Otherwise, the officer may re-enroll you for the remainder of your initial registration, as this is the usual procedure for VWP travelers traveling to Canada, Mexico or the Caribbean.
You should also know that a 1-year visa does not entitle you to stay one year in the US. The admission period for B-2 visitors is usually six months. If you want to spend more than six months in the US, you may need to make some explanations.
Also note that your last visit to the US does not have to end before your visa expires: the admission deadline is independent. For example, if your visa was valid from 1 September 2019 to 31 August 2020, you could theoretically start a six-month stay on the 31st of August 2020. The likelihood that this is allowed depends in part on how much time you have spent in the US in the recent past.
As an example of someone who did Understand that the validity of the visa does not determine the duration of each stay. If you're still in serious trouble, you might be interested in the story of Baxter Reid. Even the journalist who reports on the linked story repeats his misunderstanding of the visa rules:
26-year-old Sydney man Baxter Reid was on a five-year visa in the US and had traveled to Canada to leave the US every six months and re-enter Canada to get his visa valid.
A visitor's visa does not entitle anyone to stay in the US for the duration of the visa, provided he leaves the country and returns every six months. On the contrary, it authorizes her to submit an entry request during the visa period. For each entry request, the immigration officer determines whether the applicant is actually a temporary visitor. Someone who spends more time in the US than outside the US is not likely to be considered a passing visitor.
If a visitor is admitted to the status B-1 or B-2, the immigration officer grants a period of six months to one year (8 CFR 214.2 (b) (1) and 8 CFR 214.2 (b) (2)). , This can be extended without leaving the country by submitting an application to USCIS. However, this option is not available to VWP visitors.