No. Cultures exist. Races exist. Unique human modes of being exist. One of the most devastating effects of the European Union was the absolute desolation and loss of beautiful cultures in Eastern Europe, such as Croatia and Romania. Entire regions became ghost towns, and major cities became standardized, soulless, faceless blocks. Here's a before/after review from someone who travelled to Dubrovnik, Croatia before it…
> One of the most devastating effects of the European Union was the absolute desolation and loss of beautiful cultures in Eastern Europe, such as Croatia and Romania. Entire regions became ghost towns The same can be said for Germany's reunification. So many people moved from the former GDR to the West where the jobs were and as it's been a few years now the population is aging and dying. That is a fact. My opinion n…
Selection bias. Emigrants tend to be the least happy people - there's a reason they left. Emigrants are not a good sample of the "real" native people.
> My opinion now is that I don't think that this would've been a good reason to not reunite Germany
Sure, borders change and sometimes countries get unified. But the OP was asking about unifying the entire world, not two sides of a neighbouring country with the same language. That is a painful thought, we should be fighting to protect cultures like we fight to protect endangered species.