What exchange took place between lords and vassals under the feudal system?

Under the feudal system, lords provided vassals with fiefs (which were pieces of land) in exchange for military protection, loyalty and support. In order to do their duties and obtain the priviledge, vassals had to swear on oath loyalty to a particular lord at a feudal ceremony.  

it is

a

asked for and recieved from the united states

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.