A specified number of legally defined refugees who are granted refugee status outside the United States are annually admitted under 8 U.S.C. § 1157 for firm resettlement. Other people enter the United States with or without inspection, and apply for asylum under section 1158.
Asylum in the United States has two specific requirements. First, asylum applicants must be physically present in the United States, or at a designated port of arrival. Second, they must show that they suffered persecution in the past, or have a well-founded fear of future persecution in their country of nationality and permanent residency on account of at least one of the five protected grounds: race, religion, nationality, political opinion, or membership in a particular social group.