It's just quite possible that 'your' FRED ACKMANN b:c1844 Prussia was one of KARL CHARLES ACKMANN's brothers or close cousins! One you've determined his date of death, try to find a Death Certificate and hopefully his parents will be listed. I want to obtain KARL CHARLES ACKMANN's Pennsylvania Death Certificate (and his wife's as well).
Let me know what you find pretty please. I'm very, very, very interested. :o)