Can I marry a US Citizen if I have DACA?

Since you entered as a visitor and if you are married to a US citizen you may process US resident status in the US.

My green card was lost by the USPS?

You can pay the replacement fee or you contact the USPS or CIS and ask them to track the card.

Can H1B primary applicant apply for cancellation for H4 dependent visa?

No. The H4 applicant has the ability to withdraw not the H1b

You can change your name by marriage, in a court proceeding or at naturalization. Once you legally change your name submit i90 with evidence of...

When applying for USA tourism visa, will they ask me about previous mental disorders? And if I say no, how can they possibly fin

You need to reply honestly to all questions.

My h1 was cancelled by the employer and i filed for h4.1 week after filing for h4 if I find a project can i move back to h1.

Get the H-4 approval and then have the employer re apply

Late filing of I751

I concur with my colleagues provide an explanation for the late filing.

My visa & husband's visa was revoked by the visa counselor in embassy because I was pregnant when I got visa & gave birth there

You can reapply or seek review but you have better possibility with a re application and that possibility is low.

Canadian Citizen, on an L-1A visa - advance parole required?

You do not need advance parole but it is recommend when you are eligible for it. Speak with your employer's immigration attorney.

If i get the dream act as a student do i classify as a naturalized citizen or a permanent resident?

There is no dream Act. There is deferred action although, part of the executive action is now on hold. The Executive action in of itself does not...