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Citizenship Application Form N400 is used for obtaining US Citizenship (naturalization). A completed error-free form N400 should be filed with the United States Citizenship and Immigration Services (USCIS) along with photos and supporting documents as outlined in the Citizenship Application filing instructions.
Becoming a U.S. citizen has many advantages including the right to vote and the ability to sponsor relatives to come to the United States. The Citizenship Application (Form N-400) is completed by Lawful Permanent Residents (Green Card holders) over age 18 who meet the eligibility requirements to apply for US citizenship.
In order to apply for U.S. citizenship, you must meet the following requirements:
Be a person of good moral character and willing to abide by the principles of the U.S. Constitution.
When applying for U.S. Citizenship through naturalization, United States Citizenship and Immigration Service (USCIS) does require a Citizenship test to be taken by all applicants. The Citizenship test will be based on the ability of reading, writing and speaking English, knowledge of American history and the government of the United States.