What is the historical significance of interposition and nullification?

Answer 1

Interposition: means that a state of the U.S. may oppose any federal action it believes encroaches on its power

Nullification: refers to a U.S state refusing to enforce a federal law on Constitutional grounds.

Their historical significance can be traced back to the Brown v. Board of Education trial, where the Supreme Court declared that racial segregation in public schools violated the Equal Protection clause of the 14th Amendment. In response to this case, State legislatures from Alabama, Georgia, Mississippi, South Carolina, and Virginia adopted resolutions of "interposition and nullification," where they could oppose the ruling and refuse to enforce the desegregation of public schools.