Which of the following was not one of the more unfortunate aspects of the california gold rush?
a. some employers exploited the native american workforce to the point of enslavement due to the labor shortage.

b. many of the miners returned to their home states penniless and disillusioned due to a gross overestimation of gold.

c. enormous amounts of sediment built up in california waterways, killing wildlife and creating dangerously high water levels.

d. the majority of the people who quickly moved to california returned home just as quickly, leaving the future state a barren wasteland.