World war i was known to have caused the destruction of kings and empires, the introduction of chemical weapons, airborne bombing and tanks. which of these groups were brought into the workforce of many countries for the first time?

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.

what is the question?