Explain the opposite ideas of confederate and the union

Slavery was a major cause of disunion. Although there were opposing views even in the Union States, most northern soldiers were mostly indifferent on the subject of slavery, while Confederates fought the war mainly to protect a southern society of which slavery was an integral part.

The opposite idea of Confederate and the Union is a complete no to slavery

whats youre

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;