What is one common reason an N-400 application might be denied?

One common reason an N-400 application might be denied is the failure to demonstrate good moral character. In the context of U.S. immigration law, applicants for naturalization must show that they possess good moral character during the statutory period, which is generally the five years leading up to the application (or three years if married to a U.S. citizen). This assessment includes reviewing the applicant's conduct and any criminal history, as certain offenses can disqualify them from demonstrating good moral character. The U.S. Citizenship and Immigration Services (USCIS) evaluates factors such as adherence to laws, respect for the rights of others, and other moral considerations.

While not submitting additional documents, not attending the initial interview, or applying incorrectly can also lead to denial, they are often addressed through additional communication from USCIS or can be rectified with proper documentation. Good moral character, however, is a more intrinsic quality that, if lacking, can lead to an outright denial of the application.