When did South Carolina state it had the right to nullify unfair taxes in the 1800s?

Answer 1

South Carolina issued the Ordinance of Nullification in 1832.

Here is the background behind nullification:

In the early 1800s, the North began industrializing while the South remained mostly agrarian. In 1828, Congress passed a protective tariff aimed at helping the nascent industry in the North. This tariff, however, hurt southern cotton production and infuriated southern states so much so that they labeled it the "Tariff of Abominations".

Some felt that the issue justified secession from the Union. Vice President John C. Calhoun, from South Carolina, proposed a less drastic measure, nullification with proclaimed that the federal government only existed at the will of the states. Consequently, the states could nullify any federal law within its borders that it found unconstitutional. Calhoun argued that the states could even declare such a law void.

In 1832, Henry Clay passed a new tariff bill through Congress with lower rates. Despite this, many southerners still felt the tariff unjust and South Carolina enacted the Ordinance of Nullification.