This may sound like a dumb question, but I’ve often wondered how Nazi occupiers were able to single out Jews. It may have been easier to identify in Germany but when they took over a new country, how did they know who was/wasn’t Jewish? Was it common to have your religion on your identification, etc? Wouldn’t it have been easier at the time to just say you weren’t a Jew? How were they able to confirm the ethnic/religion background of millions of people?