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Extraordinary Ability - If you possess sustained international or national acclaim in your field and you are coming to the United States to continue working in your field, you may qualify for immigration as a priority worker.
Marriage-based Immigration - If you are a US citizen, you may petition your spouse for a green card as an Immediate Relative.
The Immediate Relative category also includes unmarried children under 21 or parents of U.S. citizens, and is not subject to visa backlogs.
Healthcare Workers – If you are a professional in the healthcare field, you may be sponsored for a temporary worker visa or for a green card. A special group of healthcare workers may qualify for green cards as Schedule A occupations that do not undergo the lengthy process of foreign labor certification.
Naturalization – In general, if you have been a permanent resident for at least five years, or in certain cases, for three years, plus you meet all eligibility requirements, you may apply for naturalization as a U.S. citizen.