Because it would abolish slavery in all of the new territories; territories that were acquired from the Mexican War
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Northern abolitionists.
The north
They generally favored it.
Northerners favored it because it banned slavery in the land obtained from Mexico, aka the Mexican Cession, thus making another step toward abolishing slavery. They supported this so much, that antislavery northerners created a new party, known as the Free- Soil Party, which supported the Wilmot Proviso. Southerners, however, opposed it, and wanted more land that allows slavery.
They were divided but most favored the abolition of slavery.
wilmot proviso
What was the unstated goal of the Wilmot Proviso?
Southerners opposed the Wilmot Proviso. This is because the Wilmot Proviso established peace with Mexico, and the land that Mexico owned was in the South.
Wilmot's Proviso brought the future of slavery to everyone.
The Wilmot Proviso qualifies as such. It however, was one of the leading causes of the American Civil War (1861-1865)
The Wilmot Proviso (1846) prohibited slavery on any land acquired from Mexico.