Depends on the visa you have and whether you can get a different visa. Need more details...

I am currently overseas. How can I sue a business which I have invested cash into or the CEO that is in the US.

Depending on the agreements, you may have the right to inspect. It may help to point out the provisions and laws that protect your rights as an...

What can i do if i dont have the document of income taxes or spouse to become a returning residence visa in my contry ?

Not sure what you mean. Are you trying to use US tax documents to get a residence permit in another country?

Filing taxes for spouse living abroad?

If you are married, you are married...

What documents are required to have an international business?

Not sure what you mean re: "international business under U.S. law." Basically, it sounds like you will have two businesses in two different...

Tax

Have you considered TurboTax?

Where to form LLC ?

Generally, Illinois.

Steps to take that will protect a company while liaising for an international company.

Consult with a cross-border law firm and local counsel. See the link below, for example.

Nonresident alien do I have to pay income taxes on my country?

I think the answers above assume that you will continue to work and live in Portugal. Is that correct?

Can I transfer profits that US LL made after paying taxes to individual account in foreign country ?

Non-citizens can register LLC's in the US states. LLC owners can distribute an LLC's profits to a bank account in India. This will likely be...