Three examples of american expansion the 19th and 20th centuries

In the nineteenth century, the Thirteen Colonies annexed Florida, ceded to the U.S. by Spain, purchased the Louisiana (currently, all the states west of the Mississippi River) from France, the annexation of Texas and the purchase of New Mexico, Arizona, Nevada and California after the Mexican-American War, the annexation of Hawaii and the purchase of Alaska from Russia.

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.