In 1832, the South Carolina legislature voted to declare a federal tariff unenforceable within the state. President Andrew Jackson responded to this "nullification crisis" by

President Andrew Jackson responded by signing the Force Bill and the Compromise Tariff Bill in 1833.

Explanation:

The president issued a Proclamation to the People of South Carolina stating the supremacy of the federal government. The force bill was signed by the congress on March 1, 1833 stating the use of the military to enforce tariff if necessary. South Carolina had threatened to secede if tariffs we're enforced. They backed down when they couldn't get other southern states to support them.

Threatening to send federal troops to the state to enforce the law.

Jackson responded to the "nullification crisis" by threatening to send federal troops to the state to enforce the law.