Which state was the first admitted to the Union after the ratification of the Constitution???

Vermont

Explanation:

The state 'Vermont' was first disclosed to the union post the development of the constitution. It is located in the United States's New England province with its boundaries upsetting New York. It was admitted in the year 1791 dated March 4 post the Revolutionary American war through an act passed by the United States' Congress. After this, 37 more states have been acknowledged as the states of the United States. Thus, 'Vermont' is the correct answer.

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