Form N-400, Application for Naturalization, is used to apply for U.S. citizenship through a process known as naturalization. Naturalization, one of four basic ways to become a U.S. citizen, is a process that lets people born outside of the United States become U.S. citizens.
U.S. Citizenship & Immigration Services (USCIS) is responsible for reviewing the N-400 application and making a decision.
There are several requirements that must be fulfilled before an individual can apply for U.S. citizenship through naturalization.
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