Does the us still practice the policy of manifest destiny in the world?

Yes, examples are the conflicts in the Middle East, the Vietnam War, and really all modern American conflicts

Explanation:

All these wars have been for resources, such as oil, and power in those regions, even though the government's American exceptionalism propaganda says otherwise.

the event that was most responsible for ending the great depression is world war 2.

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.