What was the wilmot proviso and by what part of the country was it was favored?

The Wilmot Proviso was an 1846 legislative proposal aimed at banning slavery in any territory acquired from Mexico as a result of the Mexican-American War. It was favored primarily by Northern Democrats and Whigs, who opposed the expansion of slavery into new territories, believing it would give the South more political power. The proposal highlighted the growing sectional tensions between the North and South over the issue of slavery. Although it passed in the House of Representatives, it ultimately failed in the Senate.