What change resulted in the building of european megaliths?

Thank you for posting your question here at The knowledge of agriculture, and the need for astrological information for the timing of the growing season, plus mans inate superstitions and a need to worship. I hope it helps. 

Just think, why was it effective? -it appeled to critics because it was written well, that made it noticeable to the public including the white population-it was also recognizable to the african americans because it was about their heritage.-it was powerful just keep finding more points and elaborate on them. message me if you need more