Once the adoption or grant of custody of a child is finalized in the foreign country the adopted child must obtain an immigrant visa before he/she can enter the United States. The child will be issued an IR-3 or IR-4 visa. The IR-3 visa will be issued when the adoption was finalized in the foreign country, both parents physically saw the child prior before or during the adoption proceedings, and the State where the adoptive parents reside does not require re-adoption in the U.S. An IR-4 visa will be issued when the full adoption did not occur in the foreign country and the adoptive parent(s) have guardianship over the child. A child admitted to the U.S. on an IR-3 visa will be granted citizenship automatically upon entry, while a child who enters the U.S. with an IR-4 visa will acquire citizenship with a full and final adoption in the U.S. An immigrant visa is obtained at the U.S. Consular office in the foreign country.
If you are approved for a green card at a U.S. consulate or U.S. embassy, you will not receive it until after you enter the United States. In order to enter the United States, you must have a visa. Therefore, when you are granted the right to a green card, you are issued an immigrant visa. An immigrant visa enables you to enter the United States, take up permanent residence and receive a green card.