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Can I change the date of immigration to the United States after I get an American visa?

After successfully obtaining an American immigrant visa, the applicant will find that there is a validity period on the visa, during which he can enter the country at any time, but this validity period cannot be changed or extended.

If the applicant cannot go to the United States within the validity period of the immigrant visa, the visa will expire and be invalid, and he must apply for entry again.