The founding of which party was the first significant effort to create a broadly based sectional party addressing itself to voters' concerns about the extension of slavery?

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The Free-Soil Party was founded in 1848 with the goal of opposing the expansion of slavery into newly acquired territories. It was the first significant effort to create a broadly based sectional party addressing voters' concerns about the extension of slavery. The Whig Party, Democratic Party, Know-Nothing Party, and Republican Party all existed at the same time, but had different focuses and origins. The Whig Party was founded in the 1830s as an opposition party to Andrew Jackson and dissolved in the 1850s due to internal divisions over the issue of slavery. The Democratic Party had strong southern support and generally endorsed slavery. The Know-Nothing Party was primarily concerned with nativism and limiting immigration. The Republican Party was founded in 1854 and was primarily focused on opposing the expansion of slavery; its formation was a result of the disintegration of the Whig Party over the issue of slavery. However, the Free-Soil Party was the first significant effort to create a broadly based sectional party specifically addressing the issue of slavery.

The Founding of Which Party Was the First Significant Effort