Why was it necessary in 1868 to apply the federal bill of rights to the states with the 14th amendment? a) to establish civil rights b) to prevent states from continuing the practice of slavery c) to give the federal government the power to prevent rebellions d) to establish proper checks and balances between state and federal governments

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.