They wanted to cover it up so the people don’t rebel or become afraid in America.
Life was horrible for the Jews because the Nazi's threw them out of their houses and on to the streets and put them in concentration camps and made them work for very little and gave them very little food to survive on. They [it them in Gas chambers lying to the Jews saying it was shower time and the had a mass killing many were killed in Auschwitz Birkenau.
Your answer would be, that the rulers of European states, had to split with the Roman Catholic Church, and the Protestant churches.
Hope that helps!!!