There's an IA marriage record for J. B. WELZENBACH, age 29, to Alice MOHR, age 27, on 31-July-1896 in Davenport, Scott Co, IA.Groom's father was Anton WELZENBACK.Bride's parents were Hans MOHR and Lina WIESE.
There's also a marriage record for an Amelia MOHR to Henry Hugo DOERING which lists the same parents for the bride.
The 1870 census for Davenport, Scott, IA: MOHR, Hans age 39 b. Holstech Lena age 30 b. Holstech Heinrich age 12 b. IA Emilie age 6 b. IA Anna age 4 b. IA Ella age 1 b. IA
I think Emilie is Amelia and Ella is Alice.The ages match with their marriage records.
There are several other families on the same census page that list Holstech as their place of origin.I think it might actually be Holstein.