Answer:
1.European monarchs were fed up with the Church dominating everything.
Explanation:
As the church was gaining more and more power, the diverse monarchs were already tired of habing to answer to the Vatican, and because it was a large source of power before they had to do it, but since British had left the vatican and started their own religion, that was lead by the king other monarchs assumed and started to think that it was no longer necessary to be backed up by the pope to be able to rule a country, this added up with the ideas of the reinassance helped to emancipate empires from the vatican influence.
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They were treated poorly because of the same reason the Nazi's treated adult jews; it was because of their heritage. After they were sent into camps, it did not matter how old they were, no one was spared of his wrath.
If you want to know exactly what happened to them with great visuals, I suggest plugging "Children of The Holocaust" into YouTube and finding a great visual explanation to go along with your research.