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Dear Kathleen O’Connor,
Thank you for posting your request on History Hub!
The Irish Potato famine origins begin just before 1850 due to potato blight. You can locate more information through a variety of sources by searching for “Irish potato famine” or “Irish Immigration” but you can contact the National Archives in Ireland at nationalarchives.ie In addition, their web page for genealogy research is https://www.nationalarchives.ie/genealogy/
Depending on where and when your relative arrived in the United States, there could be records related to their arrival. For example, for arrivals at New York you can access the Access to Archival database from the United States National Archives https://aad.archives.gov/aad/series-description.jsp?s=639
That list is for New York but there were many ports where Irish Immigrants landed in the United States. You can enter the name of your relative and search the National Archives Catalog The National Archives also provides a web page which will assist you in your search https://www.archives.gov/research/genealogy/start-research
The National Archives and Records Administration provides a link to records that can be accessed through Familysearch.org. (Familysearch is a free site to use but requires a Password and Login). As an example, Boston passenger lists are broken into two groupings
Boston Passenger Lists for 1820 through 1891: Massachusetts, Boston Passenger Lists, 1820-1891 — FamilySearch.org
Boston Passenger Lists for 1891 through 1943: Massachusetts, Boston Passenger Lists, 1891-1943 — FamilySearch.org
there is also an index available via family search for the years 1899-1940: Massachusetts, Boston Passenger Lists Index, 1899-1940 — FamilySearch.org
In addition, Ancestry,com (a fee based web service) provides a link to search Passenger Lists at https://www.ancestryinstitution.com/search/categories/img_passlists/
We hope this is helpful and assists you on your search!