It wasn't a "king", it was Hitler who ordered the persecution of the Jewish.
Because of ignorance, intolerance and bigotry.
The Jewish people
The Holocaust was about race, not religion.
it was one of the principles of Nazism.
During the Jewish persecution Hitler was in power. and he was incharge of every thing that was happing to the Jews.
It was during the Passover
He thought they were related to rats and his mother died of a disease and blamed it on the Nurse because she was Jewish.
There was no persecution of Jews in the US
It is Hanukkah, which commemorates the victory of the Jews against religious persecution from the Greeks.
Yes. See the attached Related Link.
Judaism.See: a list of anti-Jewish attacks in Europe