Foreign nationals who wish to work in the United States for a specified period of time must obtain a non-immigrant temporary worker visa. These visas are not considered permanent or indefinite visas.
Before applying for one of these visas, the prospective employer must first petition the United States Citizenship and Immigration Services (USCIS) on your behalf.
To apply for a non-immigrant work visa, the application must be approved by the employer.
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Steps to Follow to Work in the United States on a Temporary H-2 Visa
What are the types of H-2 visas that exist in the United States?
They are divided into 2 types: the H-2A visa and the H-2B visa. Although both are intended for temporary workers coming from abroad, type A is used for agricultural activities, such as planting, fertilizing and other cultivation activities.
On the other hand, with type B you can get positions in cleaning, construction, gardening, hotels, as well as factory workers, waiters, forest workers and animal care workers.
Source: Eluniverso

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