According to Jackson, how does the Constitution incontrovertibly create a union of states under one nation, and what inevitable result will occur should a state attempt to secede from membership?

Constitution creates unity of the states due to its amendment.

Explanation:

Constitution incontrovertibly create a union of states under one nation because it covers all the section of human life which is acceptable for all people. In Constitution, there is right of freedom, speech and other rights which make the Constitution good for the people of united states. It also gives authority to the states to self government and reduce the interference of the federal government so that's why the states united under one nation and work for the prosperity of the country. If a state secede from membership, it disturbs the unity of all states.

there are many answers to this question, such as a diplomat, ambassador, soldier, united nations employee, cia, etc.