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Is the green card obtained by skilled immigrants in the United States permanent?

After obtaining a green card, you must meet the requirements for residence in the United States. If you do not live in the United States for a long time, once the immigration officer finds out, he has the right to cancel your green card when you enter the country. The U.S. green card is usually valid for 10 years. After the expiration, if all the requirements are met, the green card can be extended.