What was the primary pull-factor in getting people from around the world to move to California from 1849-1858?

The discovery of gold was also a huge pull factor that had made people migrated and go to California hoping for a better life and getting successful as well as getting wealthy. The impact of their migration is that they made the California population increased and made it the most significant event in the U.S. history.

The study of where things are 

Answerweathering;