In what way does banneker compare the american colonies to slavery?

Benjamin Banneker was a brilliant, self-taught African-American astronomer and mathematician.

In a letter to Thomas Jefferson, he points at the contradiction between the high ideas incorporated into the Declaration of Independence and the Bill of Rights, and the persistence of slavery.  Banneker used religioius arguments against racial opression, stating that all men are created equal by God.

Explanation:

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.