I have a Johann Allers family group that lived in the Bremen area in the Selsingen Church Parish. Johann (later John) and family immigrated to Minnesota in the late 1800's. I have the Selsingen Church Parish records on microfilm 1704 - 1860. If you have any specific names and places I'd be happy to cross check my records for a connection. There were several Allers families, with a few spelling variations from the area. I assume they are all related at some point in the past. Please feel free to contact me, happy to help and share. We might even discover new connections!
Jon in Seattle