Dear Giovanna Mastrovich,
Thank you for posting your request to History Hub!
We suggest contacting the Milwaukee County Register of Deeds in order to get access to the marriage records you are seeking for Mille Majstorovic and Mary Bencetic. Genealogy research can be scheduled at that location, or a copy can be ordered online or through the mail. The Federal Government does not ordinarily create or maintain birth, death, marriage, or divorce records. Such records are made and kept by State and local governments rather than the National Archives.
We also did a primary search on Ancestry for this record but did not find any entries matching your request. It is possible that these records have not been digitized yet. If you would like to investigate further online, we suggest using either Ancestry or Family Search. There may be a fee for using the Ancestry service, but Family Search is available for free with the creation of an account. Ancestry may be accessed for free through a NARA facility or through any participating universities or public libraries.
As a public health precaution due to COVID-19, all National Archives research rooms nationwide, including those at Presidential Libraries, are closed to the public until further notice. Please check NARA’s web page about COVID-19 updates for the latest information. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!