The 20th.
16th centry
1800
i think 17th centry in britian.check it on google...
in the 20 centry
Hitler and other Nazis decided to start up the Holocaust.
in the 13th centry
The assumption in the question is false. The Holocaust is not 'start[ing] again'.
16th centry
You could argue that the Holocaust was the start of the modernity.
no
jews were the first who were killed at the stsrt of holocaust
WW2 started before the Holocaust.