Naturalization: becoming a citizen
A permanent resident can apply to naturalize after 5 years, or 3 years if married to and living with a US citizen, having been physically present in the United States for at least half that time, with continuous residence, good moral character, basic English, knowledge of US history and government, and attachment to the Constitution. The application is Form N-400, followed by biometrics, an interview with the English and civics tests, and the oath ceremony. Citizenship cannot be lost by absence, lets you sponsor more relatives, and passes to children under 18 who are permanent residents living with you.
Education, not legal advice.
Talk to an attorney who does Naturalization work