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As the FAQ list explains, q.v., questions about Jewish history are off-topic on Mi Yodeya. In fact, a specific question listed as an example of an off-topic Jewish-history question is "In which way antisemitic attitudes against Jews began to become more extreme under the Nazi regime?".
Migration is simply closure as off-topic, with the added benefit of ...
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While I can't say for certain, I'm pretty sure these are user accounts that have been deleted.
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