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Some immigrants can base their applications to enter the country on employment status.
If an employer wants to hire a foreign national without current work authorization, the company must file a I-140 petition on behalf of that worker. All such workers require a labor certification from the U.S. Department of Labor. The labor certification process prevents foreign workers from usurping American jobs. If a prospective employee's job does not fit these criteria, the employer may not sponsor the worker. The annex also allows traders and investors to enter under the same conditions in order to carry on trade, or to establish or administer the businessperson's investments.