Who wrote the mystery document?

The author of the mystery document is Upton Sinclair.

brainliest means the answer that is best and you found it very

if you ask any question and 2 persons gave you answer for your question and the answer of one person you liked the most and found it most the we can mark it as brainliest . at the side of every person's answer an option of brainliet then we can appericiate the user by marking it as brainlist

if someone marks our answer as brainliest then we can get ranks also

done.

answer is :

many churches split during the movement.

new religions grew in popularity.