1) According to the Preamble to the Constitution of the Knights of Labor, what threats faced workers in the late 19th century?

Low wages and unsafe working conditions.

The Preamble to the Constitution of the Knights of Labor revealed that the threats that faced workers in the late 19th century are  low wages and unsafe working conditions.

The Preamble  states that:

Learn More about Constitution of Knights of Labor:

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Poor remuneration

Explanation:

The Preamble to the Constitution of the Knights of Labor revealed that the threats that faced workers in the late 19th century are POOR REMUNERATION.

The Constitution which was created in 1878, stated in the Preamble amongst other things, beginning with " The alarming development and aggression of aggregated wealth, which, unless checked, will inevitably lead to the pauperization and hopeless degradation of the toiling masses, render it imperative, if we desire to enjoy the blessings of life, that a check should be placed upon its power and upon unjust accumulation, and a system adopted which will secure to the laborer the fruits of his toil:..."

hilary clinton

explanation:

trump won the popular vote and ended up becoming the president in 2016 because of this and the electoral college.