How do these inventions and contributions from Abbas Ibn Firnas demonstrate that Cordoba was a center of learning and innovation?

the culture of the americas was influenced by the language, food, and music of africa.

explanation:

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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.