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The jews in Nazi Germany spoke german.Oh, ferchrissakes, you're really scraping the bottom of the barrel now. The OP did a 'name one' gambit, and I pointed out that there were plenty.
Now, I'm not sure if you know this, but in WWII, the Germans fought more than just their own German-speaking Jewish population. They fought the French (don't speak German), the British (don't speak German), the Americans (don't speak German), the Polish (don't speak German), the Belgians (don't speak German), the Soviets (a collection of people, none of whom speak German), the Danish (don't speak German), the Norwegians (don't speak German), the Canadians (don't speak German), the Australians (don't speak German), the Dutch (DO speak German... but their assisting colonies didn't), the Indians (don't speak German), the Kiwis (don't speak German), the South Africans (don't speak German), the Greeks (don't speak German), the Chinese a little bit (don't speak German), the Rhodesians (don't speak German), some Yugoslavians (don't speak German), the Kenyans (don't speak German), an assortment of smaller, lesser-involved nations such as Costa Rica (also don't speak German) and, towards the end of the war, Italy... which doesn't speak German.
Not to mention that on the eve of the war, there were only about 200,000 jews left in Germany - most emigrated in the half-decade beforehand to distant places like the US. The 6M jews that were killed in the Holocaust were drawn from all over Europe - about half of them from Poland. It wasn't 6M German-speaking jews that died in the camps.
WWII claimed the lives of over 60M people, and 200k people is a rounding error on this number. It's drawing a ridiculously long bow to claim it as a civil war because a few of the victims lived in-country.
> you can't just hand-wave civil wars away.
Again, I wasn't. I was responding to the OP's 'name one'. It wasn't even a 'name one where it's a cause', just 'name one where it's a barrier'.