I have a Robert Schmoldt, married 1852 in Hamburg to Johanna Blohm, who emigrated to Ilinouis, Johannas brother Johann Wilhelm Blohm *Drochtersen 18/01/1820 (Germany) emigrated 1846 to the USA, landed in New orleans and making his way to Cass Co, IL, His sister with husband joined later. Also they had August, Dorette, Lotte and Trinchen as siblings, who stayed in germany.
As well I have seen August later in your lines, maybe they are conected.
The area the "Schmoldt come from is probably a small village called "Osten" where I have a line going back to ab 1550. This is in "North" of Germany nearby rivers....
Maybe that you know now more and we can find conections