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How did the rivalry between Andrew Jackson and John C. Calhoun intensify the Nullification Crisis?

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Jackson's “Proclamation to the People of South Carolina” — Nullification Crisis U.S. Pres. Andrew Jackson issued his “Proclamation to the People of South Carolina” on December 10, 1832, in response to South Carolina's refusal to be bound by federal tariffs. In it Jackson asserted the supremacy of the federal government and rejected South Carolina's argument that it, as a state, had the right to reject laws made by the federal government that it deemed unconstitutional. Jackson's proclamation was an escalation of the Nullification Crisis, and some argue that it helped lay the foundation for the American Civil War.

The rivalry between President Andrew Jackson and Vice President John C. Calhoun significantly intensified the Nullification Crisis, transforming a policy dispute into a personal and political confrontation.

The estrangement began with the "cabinet crisis" involving Peggy Eaton, whom Calhoun’s wife helped ostracize. Jackson, who defended Eaton, grew increasingly hostile toward Calhoun. Tensions deepened when Jackson learned in 1830 that Calhoun had previously urged his censure for his 1818 military actions in Florida.12

These personal grievances merged with political conflict when Calhoun emerged as the champion of nullification, a doctrine asserting that states could block federal laws they deemed unconstitutional. As Calhoun moved to protect Southern interests—specifically slavery—against federal authority, Jackson viewed his actions as a direct threat to the United States and the supremacy of the federal government. Jackson’s determination to preserve the Union and his willingness to use the Force Bill were fueled by his desire to counter the challenge posed by his former ally, ultimately forcing South Carolina to retreat from its nullification stance.3452