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There were three principles created by Chief Justice John Marshall
1: the constitutional is the supreme law of the land
2: the court has the power to rule that a law is unconstitutional
3: in the event of a conflict between laws, the constitution MUST be followed.
World war 1 veterans weren't very highly respected when they returned and many of them were traumatized after the events of ww1. This led to many developing alcoholism problems, not finding jobs, or anything similar. It would make sense for them to ask the state for help considering they became the way they are because they defended their country in the war.