Quota System: A system that limits the number of immigrants allowed from each country, which was a key feature of the INA when it was first enacted in 1952.
Family-Based Immigration: A system that allows U.S. citizens and permanent residents to sponsor certain family members for immigration to the United States, which was expanded under the INA.
Employment-Based Immigration: A system that allows employers to sponsor foreign workers for permanent residence in the United States, which was also established under the INA.