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the astrolabe, an example of improved technology of the 15th and 16th centuries, had the greatest impact on
a) literacy rates.
b) building methods.
c) navigation skills.
d) artistic techniques.

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.

c. extended rights of citizenship to new groups