Armenians constantly mourn victims of Turkish genocide of early 20-century reminding the rest of the world to the best of their ability to be heard. Russians remember the millions that perished in WWII with religious fervor. Rather subsiding it has become one of the main themes in music, literature and movies 65 years after the war ended. Native American Indians continue their mourning about the lost cultures with the coming of the white man to this day. This theme prevails over any others. Serbia never stopped mourning massacres of invading Muslim armies centuries after it all ended. Want more examples ?
Woman arrested trying to jump White House fence (Reuters)
from the article: Polish bishop accuses Jews of using Holocaust as propaganda