Final answer:
The Wilmot Proviso Act sought to prohibit slavery in territories acquired from the Mexican-American War, sparking a divisive national debate.
Explanation:
The Wilmot Proviso Act was necessary because it aimed to prohibit slavery in any territory acquired as a result of the Mexican-American War, thereby reigniting the debate over slavery in the United States. The Proviso was introduced by Democrat David Wilmot in 1846, passed in the House of Representatives but failed in the Senate, showcasing the sectional divide on the issue of slavery expansion.
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