And before Germany, Wroclaw was Czech, as Silesia was one of the lands belonging to the Crown of Bohemia. :)

Yeah, a world where you can claim territory based on who it belonged to in the past is a world where wars and chaos will be a permanent fixture on the landscape.

Even in the US, parts could go to Spain or Mexico, the UK, or France, or whatever other country. Or all the land could just go to the Native American tribes.

That's why we have international law and norms now, in order to prevent all this. Putin violated those norms.