What city became a major emigration center for individuals emigrating from the east?

New york city.

Explanation:

Hope this helps.

according to this text from the preamble to the declaration, who gives men their unalienable rights?

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.