why are people in the 1950s-1970s so hungry for new religious answers to their problems and how does jim jones offer them an answer

Jome was known as the master of the manipulators. People had numerous questions, on the basis of their feeling of being discriminated on the grounds of religion, race etc. And Jome Integrated white and black populations together and asked them to live with equality and respect towards each other. He turned into a politician and his followers trusted and campaigned for him. 

He issued the emancipation proclamation. it started changing slavery, and eventually lead to the freedom of slaves.