Naturalization is the process by which U.S. citizenship is granted to a foreign citizen or national after he or she fulfills the requirements established by Congress in the Immigration and Nationality Act (INA).
In most cases, an applicant for naturalization must be a permanent resident (green card holder) before filing. Except for certain U.S. military members and their dependents, naturalization can only be granted in the United States.
You May Qualify for Naturalization if:
Note: You may also qualify through other paths to naturalization if you do not qualify through the paths described on the links to the left. See the “A Guide to Naturalization" link to the right. Chapter 4 of the guide discusses who is eligible for Naturalization.
How to Apply for Naturalization
To apply for naturalization, file Form N-400, Application for Naturalization. See the "N-400,Application for Naturalization" link to the upper-right for the form and its instructions.
For more information, check the “A Guide to Naturalization (M-476)" link to the upper-right. We also provide educational materials to help you prepare for the English, U.S. history and civics portions of the naturalization test, including:
See the links to those resources to the right, and also check the “Naturalization Test" link to the left for even more test information and resources.
If you are in the military and are interested in becoming a U.S. citizen, please check the “M-599, Naturalization Information for Military" link to the right.
Note: You may already be a U.S. citizen and not need to apply for naturalization if your biological or adoptive parent(s) became a U.S. citizen before you reached the age of 18. See the “Citizenship through Parents" link to the left.