Why did Webster and Jackson oppose nullification?

Answer 1

Because they thought it was wrong

Answer 2

Webster and Jackson opposed nullification because they believed that it undermined the authority of the federal government and threatened the stability of the Union. They argued that only the federal courts, not individual states, had the authority to interpret and enforce the Constitution. They believed that nullification would lead to the disintegration of the Union and ultimately weaken the power of the federal government.