Each year, hundreds of thousands of permanent U.S. residents become naturalized U.S. citizens. But citizenship does not happen easily or automatically. Applicants must be at least 18 years old, have continuously resided in the United States for at least five years, be a permanent legal resident and meet other requirements. If you want to become a apply for U.S. citizenship, talk to an immigration attorney who has experience with the naturalization experience. Your lawyer can ensure you meet the requirements, help you complete and file the N-400 Application for Naturalization, and prepare you for your interview with the U.S. Citizenship and Immigration Services (USCIS).