Will it be difficult to enter USA after a month after the approval of i539?

Might be hard because you extended your previous stay and are coming back 3 weeks after your departure.

Requirement of stay for green card holder in USA

To maintain residency in the United States, you should be a resident of the United States. Yes you can stay abroad for less than 6 months, or even...

Was asked my age during an interview and I refused to answer then he sent me on my way. What can I do about this?

What do you mean sent me on my way? Should’ve answered question since it’s a basic question.

Concurrent Filing of I-485 and I-130. Got an RFE, requesting I-864.

Tax, w2, employment letter or pay stubs, proof of us citizenship or permanent residency

Filed my I485 in NY employment based December 2013. March of 2014 I went to Federal Plaza.

Do an infopass or call the 1800 number.

Do I need an approval notice from my last H-1B transfer petition in order to extend my H-1B status?

NIW? If you’re not from India or China you can already apply for adjustment

Does my husband's green card interview have to be held at the consulate in Mexico?

Waiver can be here – provisional waiver.

Which visa is my best bet?

You can apply for the work permit after entering on a fiancé visa, or apply with your adjustment of status app.

Got H1B approved but still waiting J1 Waiver...

Was your program funded by the government? Sometimes even with a NOS, CIS will deny the waiver due to government funding.

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How can I bring my spouse from India to Unites states and how long is the process until she arrives in US

You can file the petition now, then switch categories once you become a citizen around December.