There are many published sources of immigration records or passenger records, and sources are also available on Ancestry.com and other online research services.
Naturalization was a two-step process. After living in the U.S. for two years an individual filed a Declaration of Intent. Three years later, a Petition for Naturalization could be filed. Naturalization records prior to the creation of the Immigration and Naturalization Service (INS) on September 27, 1906, are found in federal, state, county, or municipal courts. ADAH has a very limited number of naturalization records filed in county probate records. Check the
County Records on Microfilm Database for records available at ADAH.
For records after September 1906, contact the National Archives at
www.archives.gov/genealogy/naturalization.