Can I sponsor USA B1/B2 Visitor Visa to my girl friend who is from Tunisia ? Met each other over online and want to meet here ?

Visitor visa does not need a sponsor. Be careful how you approach this as it appears the intent is more than her visiting the US.

What happens if I get married before my I-130 is approved?

There is no visa category for a married child of green card holder.

You should address your question and concern to Fedex HR.

Normally Civil lawsuits are not part of the immigration process.

I got the family(multiple visa) in usa for 5years.i go there two times 2014 and 2015 and stay there 5 month each,

Because it was without prejudice the chance to apply again is still there, but you must analyze in great detail what caused the cancellation are it...

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There are over 130 countries that do not require visas and England is one. Whether you will have problems based on your deportation is another story.

Getting marriage on B1/B2

A visitor visa is just what it says. Your better choice is to do exactly what you intend to do and use a fiance visa.

I recently sent Ar-11 on 10/01/2015 then on 22 I received the notice letter saying my address has been successful changed.

You not only can but must timely advise immigration of your change of address.

Marriage questions if you apply for naturalization after 5 years?

The history of the marriage does matter even at this date. Marriage fraud is huge and efforts to thwart it are played out everyday.

Frequency and length of travel outside affect my naturalization?

Your facts are not specific enough to determine if you will have problems with possible abandonment of the green card. Be prepared to show the...