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how did justinian's plague contribute to the fall of the byzantine empire

The plague heavily weakened their population, at a time where there was financial issues, and a weakened scattered army.It was like opening the tab of an upside down soda can with a hole, it just made the problem significantly worse.

the mexican-american war was a conflict between the united states and mexico, fought from april 1846 to february 1848.

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.