Can my ex get his green card even though we are divorced and I never went to interview or provided documents he needed?

He can if someone else sponsored him or he qualified for VAWA.

What happen if I married to US Green Card holder ? Would I get work authorization immediately ?

You cannot file for adjustment of status or EAD if you are married to the GC holder before your priority date on I 130 is current.

How can a stepdaughter of a us citizen who is 16 years with irs become a us citizen ?

You need to consult with an attorney: it depends on many factors.

Background check?

You just need to be patient. Officers have to do the final check before they make a decision.

How long can it take for me to get an answer?

You should work with an attorney who can review your case and let you know his/her opinion based on facts, your eligibility and history.

Why no decision about my N400 one year after interview?

The only "sure" way to get a decision on your case is to sue the government forcing them to make a decision.

Can I do freelance UX work for an American client as a Canadian

You should consult with an attorney to see what your options might be. However, TN status is employer-specific. Working for yourself is working for...

You should work with an attorney on your U visa application. Recently, it has become more difficult to get a U visa approval, and later a green...

Is my form I-601 needed if my 10 year ban has been over?

Even if you do not need a waiver, it does not mean that you will be able to get a non-immigrant visa.

Meaning of "Fingerprint Review Was Completed" status update

It does not mean anything more than the fact that the USCIS updated your online status.