What was one main argument that justified the south's right to secede from the union?

a. national sovereignty overrides state rights b. state sovereignty precedes national sovereignty c. ratification cannot be changed d. national rights are more important than individual rights

b state sovereignty precedes national sovereignty

Explanation:

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B.state sovereignty precedes national sovereignty

Explanation:

The main reason for the states to secede was that the Union was formed AFTER the existence of the states and because of that, the states did not transfer their sovereignty to the Union and had the right to dissolve the compact. They defended that the Union violated the US Constitution when it trespassed the states rights.

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i believe your answer is d)