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There are overwhelming quantities of evidence that point to the occurrence of the Holocaust. Ignoring thousands of photographs, videos and eyewitness accounts would be extremely ignorant.
The actual number of Jews killed may have been significantly lower than the historically accepted figure of 5 to 6 million.
Jews in europe
"the world population of Jews increased between 1933 and 1948 from 15,315,000 to 15,753,000."