Oh you mean after they took it in the partitions from Poland and settled it? Yeah it was definitely rightfully German.![]()
The thing is, I'm perfectly open to the idea that centuries-old claims shouldn't have that much bearing. But the reality of the situation is that Germany lost the Great War. Poland had reasonable economic and demographic claims to the region, and economically and politically it was far more important to Poland than to Germany. I fail to see what was so horribly unfair about the arrangement. Versailles had its flaws, but Germany's eastern borders were fairly reasonable.