The two correct statements regarding how the Gold Rush changed California from 1848-1850 are:
- California's overall population grew as thousands of people came from around the world hoping to find gold.
- California's native population decreased because of diseases brought by the 49ers.
These changes were significant as the Gold Rush attracted a diverse group of people seeking fortune, leading to rapid demographic changes, while the influx also had devastating effects on the Native American populations due to exposure to diseases and displacement.