Naturalization looks like paperwork and is actually an examination of a person's entire life in the country, conducted at a single interview where inconsistencies matter more than facts. This article explains the eligibility requirements one by one, with the traps inside each: how continuous residence differs from physical presence and how a long trip can silently break it, what good moral character actually covers and why it reaches conduct that was never charged, and how the English and civics requirements work along with the exemptions that many eligible applicants never claim. It then explains why the most dangerous part of the process is that applying invites full review of immigration history, and why some applicants should not apply at all. Practical sections cover the interview, what to bring, the denial and appeal routes including a hearing before a different officer and judicial review, and the separate path for people who are already citizens without knowing it. Every authority is linked to its text.