"hoover dam meets the water needs of homes and businesses in las vegas.
los angeles, san diego, phoenix, and tucson. in what region of the united states”
are these cities located?

the correct answer is d

answer: in 1900, there were no "workplace safety laws"!

explanation: at the beginning of this century, workers in the united states faced remarkably high health and safety risks on the job.

a century ago in 1900 about three hundred out of every one hundred thousand miners were killed on the job each year.

[industria] developments occurred within a legal and regulatory climate that diminished employer’s interest in safety. as a result, americans developed production methods that were both highly productive and often very dangerous.