Each year, the USCIS sets a quota for family and employment-based visas. Once the quota is met, the USCIS stops issuing visas until the next fiscal year, thus creating a backlog of visa applicants. Section 203(a) of the INA prescribes preference categories of family-sponsored immigrant visas. Classified as F2A category visas are qualified immigrants who are spouses and children (unmarried and under 21 years old) of permanent resident aliens.