Feudalism faded away because the... A. knights were mostly killed off in the Crusades.
B. rise of economies meant that kings could hire warriors.
C. plague killed most of the serfs.
D. serfs led a successful uprising.

B

Explanation:

Rise of economies meant that kings could hire warriors.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

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