Avoid forming a theory and never changing it. Remember the three "R's": Rethink -- Reanalyze -- Redo!
Registrations of births, marriges, and deaths first began for some areas in Germany in 1792 when the French invasion of the area west of the Rhine brougt that region under their administration.
Final papers are the Petition for Citizenship with supporting affidavits filed by an alien in court.
Document as you go!
[Sources - Citations]
The term "relict" refers to a widow or widower.
Look for German immigrants’ origins in published lists of emigrants (Auswanderungen) from particular areas, compiled form German records.
Book to consider for your personal genealogy reference library: Tracing Your Irish Ancestors: The Complete Guide by John Grenham.