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B

Explanation:

The Black Death brought about the end of feudalism. This was the system of service in return for a grant of land, burdening the peasant with many obligations to his lord.

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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