Ok, Artbrooks. I haven't looked into all of your examples but I did check out the Northern Poland one. I think you have misunderstood my question.

AggieD said, "it has become quite trendy to give other disposed nations their lands & rights back". Using the words "has become" suggests a new or recently started trend. The expulsion in Northern Poland was in 1945. I was asking her for examples of situations that support her contention that such practices have "become quite trendy", rather than places where it used to be trendy. I'll check out your other examples as time allows, but I don't think the Northern Poland example supports what AggieD was saying.