Ishall ask again.
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.

I'm pretty sure it is B

Explanation:

The question is asking what didn't happen and since it's not a or d that left b and c but the gold rush did cause a rivers to become clogged.

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.

i think iowa because you committed the crime there