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If you are researching your family history, the USCIS may have immigration records which may be relevant to your search, Immigration records from years past may reveal many important things about your ancestors, such as addresses and dates of arrival in the US. To get copies of records which interest you, you must file G-1041A (Genealogy Records Request). To file this request, you must have the record numbers or identifiers of the specific records you want copies of. If you do not have this information, you will need to file Form G-1041 (Genealogy Index Search Request) first, to determine whether the USCIS indices have any records which relate to your area of research.