If you are the wife/spouse of a US citizen then you can apply for a K3 Spouse Visa to enter the United States of America. You can apply for a non-immigrant K3 Visa outside of the US to join your husband in the United States.
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If you have minor children being under the age of 21 and they are still single they too can join in in the United States. This visa which they need to obtain is called a K4 Visa and they can only apply for this visa once you have a K3 Visa or awaiting one. Speak to an immigration lawyer with regards to the application process as many do prepare the paperwork while they do yours. In this way you do not need to visit their offices again to apply for the visa again as all the forms have already been completed.
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If you wife has a child you also need to apply for a K4 Visa for the child to enter the US with the mother. See the article on K4 Visa requirements.
What Is a K3 Visa?,
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