My ggrandfather was Frederick Gottlieb Boldt born in Mecklenburg (I don't know the exact location) on June 5, 1849. He received his citizenship in Bremer County, Iowa, on Oct. 4, 1876. He married Carolina Ann Abraham in Mankato, MN, on Mar 30, 1880. He homsteaded in Kingsbury County, South Dakota. They had 8 children-Alvina (Ella) Albertina, my grandmother; Bertha Emma, Paulina Amelia, Otto Frederick, Earnest A, Daniel Johann, Elizabeth Marie and Carl William. Let me know if any of this information fits into your family history. Thanks.