Can foreigners register their works in the U.S.?
Any work that is protected by U.S. copyright law can be registered. This includes many works of foreign origin. All works that are unpublished, regardless of the nationality of the author, are protected in the United States. Works that are first published in the United States or in a country with which we have a copyright treaty or that are created by a citizen or domiciliary of a country with which we have a copyright treaty are also protected and may therefore be registered with the U.S. Copyright Office. See Circular 38a for the status of specific countries.” The site has a lot of useful information, It’s http://www.loc.gov/copyright/ P.S. INALB – I don’t believe you need to register it in the U.S. to sue someone in the U.S. if the infringement took place here.
