Final answer:
The conflict over the Tariff of Abominations and Nullification Theory became an issue about states' rights as Southern states opposed federal tariffs. Nullification was proposed as a way to protect the South's economic interests.
Step-by-step explanation:
The conflict over the Tariff of Abominations and the subsequent Nullification Theory became an issue about states' rights as Southern states opposed federal tariffs. The tariff, which raised prices for imported goods, was seen as harmful to the South's economy, especially the cotton industry. Southern states, led by John C. Calhoun, argued for nullification, the voiding of unconstitutional federal laws, as a means to protect their interests.