You don't believe honestly that in those territories Germans lived and thrived for 120 years only?
You mean in Poznań? The same ancestral capital where the tombs of some of our greatest rulers are? The same Poznań that was a part of Poland for 792 years before Germans took it?
Yep, untill the partitions Germans had absolutely no claim on it and were a minority in the region, on the same basis you could claim that Turks have claim to Berlin.
Should I show you the list of Danzig again with poets, scientists, famous people from back to 1400?
Two can play that game but it doesnt change the alliegiance of the city, who built it, who and when inhabited it, the city is Polish-German at best, more fitting would be a Polish city with a significant German heritage to it.
We could argue that the German majority made it a German city but the German majority was there for only about half of its existance and still did not stifle the Polish development of the city, then there's the case of political allegiance which for the most part was loosely or directly a part of Poland.
So if your claim is based on the fact that Germans bred like rabbits or that you built a church there i fear you'll find it difficult to argue with Turks about who's city Berlin is in about 30 years :)
What about Kopernikus? He was at least half german...
Absolutely, he's definitely half German, he was also fervently loyal to the Polish king and never in his life signed anything in other then Latin but what does it all have with Gdańsk' national and historical allegiance?
Based on your logic we should claim Chicago as historically ours.
You are kidding, don't you!
I fail to see connection between those two issues.
There's a pretty big connection between Lwów and Wrocław, we and Ukrainians are in the exact same position as Germans and us, amusingly most of Wrocław dwellers are descendants of the inhabitants of Lwów.