The United States Immigration Policy has been built in the principles of reunification of families, admitting immigrants that are valuable to the US economy, protecting refugees, and promoting diversity. While the policy has reaped tremendous benefits from opening its doors to immigrants, students, and employees, it also brings economic, social, and political controversies towards maintaining ethnic homogeneity, workers for employers versus jobs for non-immigrants, settlement patterns, impact on upward social mobility, crime, and voting behavior. The key details about existing US immigration programs include family-based immigration, refugee admissions, employment-based greencards, diversity visas, h-1b visas, temporary permissions, DACA, and temporary-protected status.