Genealogy / John Zielinski. Late 1800's Poland/Pittsburgh. [2]

I hope I've posted this in the right place I can't seem to find any information on my Polish ancestors this is all the information I have my Grandfather's name is John Zeilinski who was married to a Lucy(Lucile) they migrated to the states early 1900 or late 1800 settled in Pittsburgh PA(USA) any further information would be helpful.

Thank you,
Gypsy

Wow that is impressive to learn but I was just wondering if any of my ancestors were still alive and I do know for fact my Great grandfather's family were still alive I do remember hearing that he was a executioner for the Polish army. And my Grand father took the American last name as green so that makes sense.My birth last name is Witkowski

Thank you very much!.
Gypsy