According to INA 202(b), which country is used for per country limits on immigrant visas?

The correct choice highlights that the country used for per country limits on immigrant visas, as specified in the Immigration and Nationality Act (INA) 202(b), is the country of birth. This provision is designed to ensure that immigrant visas are distributed fairly among countries, rather than being allocated based solely on an individual's current residence or citizenship.

This means that regardless of where an individual may currently live or their nationality, the limits on immigrant visas take into account the country where they were born. This approach aims to prevent any particular country from receiving an overwhelming percentage of visas due to higher demand or population, thereby promoting diversity among the immigrant population.

By focusing on the country of birth, the immigration system seeks to balance the issuance of visas and maintain a diverse flow of immigration into the United States.