Diversity Immigrant Visa (Green Card Lottery): Available to nationals of eligible countries that the U.S. considers being under-represented in U.S. immigration. High school diploma and 2 years of work experience within the last 5 years in a field required. Maximum stay: Green Card/Legal Permanent Residency. Availability: 50,000 annually. Each country limited to 7% of Green Cards available per region. Apply in October. No filing fees.