If i take my marriage certificate with me to the USA embassy would I be eligible for a USA Visa as well?

It really depends on the type of visa he has: if it is a tourist visa, no, you would need to apply for your own tourist visa.

Should I apply a US citizenship first before filing I-130 after I marry my spouse who overstayed here on tourist visa?

I would suggest you become a US citizen first then start the process for her adjustment of status. Contact an immigration attorney to get this...

Will he ever be able to apply for his papers? If so what is the first step?

More information is needed to adequately respond but depending on the situation regarding his deportations, he may be subject to a permanent ban...

Can my entry denial be due to the ongoing legal case or there may be some other reasons?

It is likely due to your pending domestic violence case. I suggest you contact an immigration attorney.

How long will the intense immigration deportation last? Is this occurring in Chicago as well or not as much as any other places?

No, being an immigrant does not subject her to deportation. Being an illegal immigrant might subject her to deportation.

Selected as the best answer

DS 260

If your son is filling out the form for himself, the answer is yes.

If someone obtains dual citizenship, which country's laws should be applied to him/her? country of origin or the new one?

Generally citizens of more than one country are subject to the laws of both countries.

What is difference between 7 A i I and 6 c ii

Since you state that you are barred for five years, you must wait five years.

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You will have to file for an extension for your dependents as well.

USCIS.gov website that you can do a self-check ( comparable) tothe E-verify check. States it's secure-Do you recommend using

Yes, the system is safe to use and you will know whether your status is recorded correctly. Good luck!