The nullification is the right of the states to nullify the federal laws that they felt was not in accordance with the constitution of the United States.
The message of President Jackson towards the crisis by North Carolina was that it was a threat to the Federal Union and also to the Unity of the country.
As a result of this the president had to make use of his power by submitting to the congress that he would have to make use of Army troops in the state to collect the duties.
Yes his act was a way of preserving the Union. This may have stopped the Union.
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