Final answer:
The false statement is that most of the first wave of miners struck it rich in California; in truth, many did not find the expected riches and were quickly supplanted by mining companies. The correct answer is option B.
Step-by-step explanation:
With the discovery of gold near Sutter's Mill, California, in 1848, all of the following took place except B. most of the first wave of miners struck it rich in California with lucrative, easy, and plentiful discoveries of gold. Although many people, known as Forty-Niners, were attracted to California with visions of wealth, most did not find gold as easily as they had imagined. The placer gold was quickly exhausted, and what was left required more substantial mining operations. This led to individual miners often being supplanted by companies that could afford to hire laborers and purchase the necessary technology.
Miners and adventurers from around the world indeed came to California, many travelers faced illness and deadly fevers, and those providing personal services often made the most reliable profits. Also, crime soared as a diversity of people, including criminals, rushed in.