How did state constitutions aid in the creation of a national constitution?

For example, the U. S. Constitution declares itself to be “the supreme Law of the Land.” By 1780, all the first state con- stitutions plus that of Vermont had created most of the building blocks that were used to draft the U. S. Constitution at the Philadelphia Convention in 1787.

Explanation:

answer; ///i believe that the correct answer is (a) the great depression