Which of the following would make the best addition to the table?

a. mechanized manufacturing
b. streaming media delivery
c. time-study analysis
d. interchangeable parts

answer; /// i believe that the correct answer is (d)the huang he river valley;

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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