How did World War I lead to economic growth in the United States? a. Union growth
b. Corporate profits rose and so did workers' wages
c. Industrial production & retail prices increased
d. All the above

the answer is b.

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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.