All these messages for Ernest Hartz, and this message make me believe that we are family! There is also an Alfred Hartz, from Cavalier ND in my family. There is a Philip Hartz, who lived in Winnipeg, Manitoba, Canada. He would have been my grandmother's great grandfather, I believe.
There is mention of a Caroline Hartz, who married Henry Walter and lived in Haultain, Saskatchewan. and a Jacob Hartz, who lived in N.D. and moved to Haultain, Saskatchewan.
Do these match any of your family?