An agreement among railroad company owners to not let prices fall below a certain amount was called a
A. trust
B. monopoly
C. gauge
D. pool

B. monopoly

Explanation:

Horizontal monopoly agreement is a form of agreement in which the various firms or companies in the same competitive industry form and arrangement to destroy or reduce competition greatly.

Hence, in this situation, an agreement among railroad company owners to not let prices fall below a certain amount is a perfect example of a Horizontal Monopoly Agreement, which is a form of Monopoly.

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

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