Which of the following was NOT one of the effects of the California Gold Rush?
A. The Gold Rush made California's population much less diverse than it had been.
B. The rapid growth of California made the demand for a transcontinental railroad an urgent one.
C. Many employers exploited the Native American workforce to the point of enslavement.
D. The majority of people who got rich from the Gold Rush were those who supplied, transported, and sold goods to the miners.