How did propaganda and the agendas of totalitarian leaders contribute to a breakdown of democratic ideals in the 1930s?

They control the flow information in the country and make the citizens think that their government is doing a good think.

Explanation:

In Italy for example, Benito Mussolini completely control the media and use it to turn his effort to conquer other countries as a quest to bring back Italy into its former glory and bring economic prosperity to the rightful owners (Italian citizens) . This type of lie make it easier for him to gained support for the people when He decided to enter the world war ii.

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;

answer; /// i do believe but not sure(nazi propaganda)//(anti-semitism); ( holocaust) plz check first; ///good luck