Dear Mr. Cados,
Thank you for posting your request on History Hub!
Here a few suggestions that may prove useful in researching Sara Posner. First, please search for her passenger arrival record. To learn more about searching for passenger lists, see NARA’s web site at https://www.archives.gov/research/immigration.
Secondly, do you know whether she may have naturalized and become a US citizen? If it is possible she did and you have an idea of which state she resided in, you could try to locate a Petition for Naturalization. Refer to this list of states and corresponding National Archives offices to determine which location maintains the records for the area where Sara Posner resided.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from various NARA units. We apologize for this inconvenience and appreciate your understanding and patience.
And lastly, based on the time frame when Sara would have been in the country, it is possible that the Immigration and Naturalization Service (INS) could have created a file on her. To determine if a record exists, you can place an Index Search request through the US Citizenship and Immigration Service (USCIS) Genealogy Program.
We hope this information is helpful. Best of luck on your research!
[Information provided by Elizabeth Burnes, Subject Matter Expert]