Question

the first unions
american railway union
what was the aru?
the american reorganization union
the american railway union
the association of railway unions
a. a union for railway workers
the railroad was the number one industry in the united states in the late 1800s. with the
geographical expansion of industry across the country, there were enough national workers to form
labor union chapters.
the american railway union (aru) was formed and limited to only railway workers.
the first major strike, the great strike of 1877, involved railway workers and the railroad
companies.

Explanation:

The text on the left side of the image mentions "American Railway Union" and the question on the right asks "What was the ARU?". By matching the abbreviation "ARU" with the full name mentioned in the text, we can determine the answer.

Answer:

the American Railway Union