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What is the "priority day" for American immigrants?

Priority date is the earliest date for foreigners to submit immigration applications. For family immigration applications, this date is the date when USCIS receives the immigration application (Form I- 130) submitted on behalf of foreigners. For the application of professional immigrants, this date is the date when DOL of the Ministry of Labor receives the application for work permit (PERM), or the date when NIW) I- 140 is submitted without a work permit (such as NIW).