It is rather strange that only expats are lecturing about Polish law and none of them have any credentials.
At present, a real lawyer, who is also a law professor, has a case pending in front of the Supreme Administrative Court in Warsaw about these issues. He certainly has credentials. If he wins, he will have increased the population of the nation, and thereby its representation in the E. U. Parliament considerably. People like Kaczynski complain that Germany has a higher population after the war, but he doesn't admit that they brought back ethnic Germans by the millions from the East, most of whom never had ancestors who were born in the modern unified German state, and gave them full citizenship when they arrived in country. In comparison, those with citizenship rights coming from the founding treaties of the Second Republic are treated with contempt by the government in Warsaw, documents to prove the claim are hidden, or have never been copied from the relevant archives in the lost lands to the East.
I would contact a real attorney instead of seeking info from a forum full of trolls with an axe to grind against Americans.
I advise people to do that all of the time. The laws are quite complicated, and there is great hostility against the foreign born. Its more than they don't like Americans. Many, not just those on this forum, are very threatened by the idea of Polonia returning to the fatherland en masse.
But one must ask, why do naturalized Brits keeping coming to threads about citizenship by descent and trolling shamelessly? It was so bad that it was requested to start a blog for those who have gone through the process. I don't post the link, because it will get deleted.
It is worth noting that the Versailles Peace Conference went on for months in 1919 with the senior statesmen, and then for years after that by the diplomats until 1923. Much of that was about the rebirth of the Second Republic and its boundaries, and it was in more than one treaty. The Citizenship Act of 1920 in Article 2, section 3 acknowledged that those treaties granted citizenship. Those treaties were also litigated in courts in Warsaw, Vienna and the International Court of Justice. Anyone writing that people became stateless or retained the citizenship of the partitioning powers if living abroad is clearly full of excrement. The default was that people born within the boundaries of the Second Republic became its citizens.
Can you explain this further?
Yes, but I think this is the wrong forum for that. Everything here gets buried in an avalanche of trolling. It is easier to read in another place.