Step 1: Find Out Whether You Are Eligible. The first question is whether you have a U.S. green card (lawful permanent residence). ... Step 2: Overcome Barriers to Your Ineligibility. ... Step 3: File USCIS Form N-400. ... Step 4: Get Fingerprinted. ... Step 5: Attend a Citizenship Interview. ... Step 6: Attend the Oath Ceremony.