What was an effect of the California Gold Rush in 1849?

A. The president authorized the forced removal of the Sioux tribes in California where gold was discovered.

B. Many people discovered gold, became rich, and established multiple mining towns in
California.

C. Conflicts between U.S. settlers and foreign miners from China and Europe resulted in
military action.

D. An influx of settlers from the U.S. and the world led to the growth of numerous cities in California.