It is more effective when the people have confidence in it
In the 1920s Americans just got out of WWI and they won so there was a boost in the economy. Also, industrialization and electricity was spreading.
If you or someone you know are having visions, you should either talk to a therapist about them or somebody you can trust.
Hope this helped in some way,
-Anime
To explain phenomna power. (Idk how to exactly spell phenomna so im srry if its wrong.