I only have the information off John Henry Peter Pries' Australian marriage & death certificates which may not be entirley correct.
John was born 28 Jul 1841 in Kiel Holstein Germany.
His father was Peter Pries
His mother was Friederika which has a few different spellings, no maiden name.
I have come across an 1880 United States Federal Census which I can not access but when I rest my pointer on it I have found 'a' Peter Pries and Friederika who's ages and German birth could fit. They are living in Davenport, Scott, Iowa. I think a daughter may have married Marx Eckmann.
John Henry Peter was already in Australia by then (1866) so I was trying to find the above family arriving in the US to see if John HP was listed with them. If not just John HP Pries arriving in the US would do.
It's all very sketchy I know but it's all I have.
Thank you for trying