Perhaps the Poles should stop looking down other countries first. I've never seen something like this before where people glorify their own country as much as here: "Poland was wealthier than A", "Poland was the biggest in time B", "We saved C", "We beat country D", "Poland deserves to be in Civ more than E" and so on. The use of the term "we" is inherently weird. It shows that someone needs to claim deeds of others to build up his own ego. And some of the claimed achievements of Poland are simple wrong. What disturbs me is that they say that our western education is inadequate and the reason for our ignorance of Polish greatness, while they themselves show a significant lack of knowledge. I'm not against the inclusion of Poland in general, but I'm against the inclusion based on nationalism. I just can't stand it when someone says that his own country is better than others. Well, the Duchy of Prussia wasn't the same country as the kingdom that was later called Prussia. Prussia was inherited by Brandenburg which renamed itself as Prussia later. So, I would say that Brandenburg is the actual predecessor of the kingdom of Prussia, not the duchy.