Dear Mr. Jaballah,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 9 series, 28 file units, 140 items related to the Louisiana Purchase. Some of these records have been digitized and may be viewed online through the Catalog. To request more information about records not available online, please email the reference unit listed as the contact in the Catalog description.
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 NARA staff. We apologize for this inconvenience and appreciate your understanding and patience.
We also located the following document exhibits, articles, and blogs:
We hope this information is helpful. Best of luck with your research!