Alien Registration Number: Everything You Need to Know About This Important Immigration Identifier The immigration process in the United States involves many official documents, legal procedures, and identification systems. Among the most important identifiers used by immigration authorities is the alien registration number, often called the A-Number. Although many immigrants encounter this number while applying for visas, green cards, or citizenship, a large number of people still do not fully understand its purpose or importance. The alien registration number serves as a key part of the U.S. immigration system because it helps government agencies maintain organized records and track immigration…
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