Why did 80000 people move CA in 1849?

In 1849, approximately 80,000 people moved to California primarily due to the Gold Rush, which began after gold was discovered at Sutter's Mill in January of that year. The promise of wealth and opportunity attracted individuals and families from across the United States and beyond, leading to a massive influx of settlers seeking to strike it rich. This migration significantly contributed to California's rapid population growth and eventual statehood.