I know that at one time my great grandfather was working on the saniltary canal that ran from the city of Chicago, southwest, which is where they settled in McCook (near LA Grange). Originally they were on the East side, near Indiana. However, more Plesha's could have gone all the way to Joliet. That would be a logical route.
I have one great aunt still alive, Anne Henning, who still lives in McCook. When I had told her that I found a passenger list from a ship at the Records on Varrick Street in NYC, she said that he might have been a stowaway as well as my other great grandfather, and that would explain why Luka never had the right to vote.
Would love to know more about them as the 100th anniversary of his arrival is next year. Would also love to get to Croatia to see if I can find a birthplace.