How do you become a Nigerian citizen or get a Nigerian passport?

To become a Nigerian citizen, you can either be born in Nigeria to Nigerian parents, be born abroad to Nigerian parents, or apply for naturalization after living in Nigeria for a specified period, usually 15 years. For a Nigerian passport, you need to be a Nigerian citizen and must provide documents such as a birth certificate, a national identity number, and proof of citizenship. Applications can be submitted online or at designated passport offices, and you may need to attend an interview and provide biometric data.